Knowledge (XXG)

Risk difference

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from 1 case in 5000 to 1 case in 10,000 over one year. The relative risk reduction is 0.5 (50%), while the absolute risk reduction is 0.0001 (0.01%). The absolute risk reduction reflects the low probability of getting colon cancer in the first place, while reporting only relative risk reduction,
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It is recommended to use absolute measurements, such as risk difference, alongside the relative measurements, when presenting the results of randomized controlled trials. Their utility can be illustrated by the following example of a hypothetical drug which reduces the risk of
580: 706: 424: 911: 273:- drug reduces 2 cases of colon cancer to 1 case if you treat 10,000 people. Natural numbers, which are used in the number needed to treat approach, are easily understood by non-experts. 31:
The adverse outcome (black) risk difference between the group exposed to the treatment (left) and the group unexposed to the treatment (right) is −0.25 (RD = −0.25, ARR = 0.25).
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Moher D, Hopewell S, Schulz KF, Montori V, Gøtzsche PC, Devereaux PJ, Elbourne D, Egger M, Altman DG (March 2010).
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is the incidence in the unexposed group. If the risk of an outcome is increased by the exposure, the term
2380: 2115: 2002: 1993: 1940: 1910: 1874: 1432: 245: 2081: 575:{\displaystyle SE(RD)={\sqrt {{\frac {EE\cdot EN}{(EE+EN)^{3}}}+{\frac {CE\cdot CN}{(CE+CN)^{3}}}}}.} 1988: 1920: 27: 2241: 2191: 2006: 1935: 1893: 1710: 1372: 1265: 1045: 938: 714: 302: 200: 156: 54: 588: 2315: 2279: 2246: 2171: 2093: 1870: 1823: 1800: 1761: 1698: 1688: 1654: 1618: 282: 2089: 2010: 1964: 1959: 1839: 1792: 1751: 1743: 1646: 1610: 819: 776: 1650: 1614: 125: 94: 2284: 2062: 2310: 2231: 2183: 1976: 1888: 1756: 1731: 799: 756: 739: 270: 17: 2374: 2289: 2256: 2251: 1456: 1131: 2131: 2015: 1399: 1072: 266: 258: 193:. Equivalently, if the risk of an outcome is decreased by the exposure, the term 2325: 2179: 2052: 2042: 1796: 2127: 2119: 2085: 2047: 1954: 1687:(2nd ed.). New York, NY: Oxford University Press. pp. 66, 160, 167. 1539: 1215: 51:
of an outcome in the exposed group and the unexposed group. It is computed as
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The sampling distribution of RD is approximately normal, with standard error
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would run into risk of readers exaggerating the effectiveness of the drug.
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Studies in History and Philosophy of Biological and Biomedical Sciences
1747: 1780: 26: 701:{\displaystyle CI_{1-\alpha }(RD)=RD\pm SE(RD)\cdot z_{\alpha },} 48: 1843: 419:{\displaystyle RD={\frac {EE}{EE+EN}}-{\frac {CE}{CE+CN}}.} 269:
believe that the risk difference is best presented as a
244:, and the inverse of the absolute risk increase is the 1609:(6th ed.). Oxford University Press. p. 14. 848: 822: 802: 779: 759: 717: 620: 591: 438: 342: 203: 159: 128: 97: 57: 2303: 2265: 2214: 2164: 2138: 2100: 2070: 2061: 1987: 1934: 1881: 905: 831: 808: 788: 765: 730: 700: 603: 574: 418: 240:The inverse of the absolute risk reduction is the 229: 185: 141: 110: 83: 1643:"Dictionary of Epidemiology - Oxford Reference" 906:{\displaystyle RD=P(D\mid E)-P(D\mid \neg E).} 1855: 1822:. New York: Fourth Estate. pp. 239–260. 333:The point estimate of the risk difference is 8: 1715:: CS1 maint: multiple names: authors list ( 281:Risk difference can be estimated from a 2x2 2067: 1862: 1848: 1840: 1755: 847: 821: 801: 778: 758: 722: 716: 689: 628: 619: 590: 558: 516: 504: 462: 460: 437: 384: 352: 341: 221: 208: 202: 177: 164: 158: 133: 127: 102: 96: 75: 62: 56: 2154:Preventable fraction among the unexposed 2150:Attributable fraction for the population 1392: 1252: 1186:Preventable fraction among the unexposed 1065: 925: 839:. The risk difference can be written as 287: 2158:Preventable fraction for the population 2146:Attributable fraction among the exposed 1595: 1510:Attributable fraction among the exposed 611:confidence interval for the RD is then 1708: 7: 2321:Correlation does not imply causation 2237:Animal testing on non-human primates 1678: 1676: 1651:10.1093/acref/9780199976720.001.0001 1636: 1634: 1615:10.1093/acref/9780199976720.001.0001 1685:Epidemiology : an introduction 753:We could assume a disease noted by 891: 823: 780: 25: 197:(ARR) is used, and computed as 153:(ARI) is used, and computed as 2204:Pre- and post-test probability 1926:Patient and public involvement 897: 882: 873: 861: 679: 670: 649: 640: 555: 536: 501: 482: 454: 445: 47:is the difference between the 1: 1683:J., Rothman, Kenneth (2012). 2331:Sex as a biological variable 2295:Intention-to-treat analysis 2267:Analysis of clinical trials 2196:Specificity and sensitivity 1950:Randomized controlled trial 1797:10.1016/j.shpsc.2015.06.003 1645:. Oxford University Press. 1641:Porta, Miquel, ed. (2014). 816:, and no exposure noted by 731:{\displaystyle z_{\alpha }} 230:{\displaystyle I_{u}-I_{e}} 186:{\displaystyle I_{e}-I_{u}} 84:{\displaystyle I_{e}-I_{u}} 2402: 1606:Dictionary of Epidemiology 1579:Population Impact Measures 927:Example of risk reduction 773:, and no disease noted by 122:in the exposed group, and 2339: 2304:Interpretation of results 2037:Nested case–control study 1781:"Measuring Effectiveness" 1254:Example of risk increase 604:{\displaystyle 1-\alpha } 293: 290: 1906:Academic clinical trials 1779:Stegenga, Jacob (2015). 1262:Experimental group (E) 1086:Absolute risk reduction 935:Experimental group (E) 742:for the chosen level of 2124:Relative risk reduction 1972:Adaptive clinical trial 1916:Evidence-based medicine 1899:Adaptive clinical trial 1584:Relative risk reduction 1479:Relative risk increase 1412:Absolute risk increase 1155:Relative risk reduction 749:Bayesian interpretation 195:absolute risk reduction 18:Absolute risk reduction 2112:Number needed to treat 1108:Number needed to treat 907: 833: 832:{\displaystyle \neg E} 810: 790: 789:{\displaystyle \neg D} 767: 732: 702: 605: 576: 420: 242:number needed to treat 231: 187: 151:absolute risk increase 143: 112: 85: 32: 2116:Number needed to harm 2003:Cross-sectional study 1955:Scientific experiment 1911:Clinical study design 1818:Ben Goldacre (2008). 1603:Porta M, ed. (2014). 1433:Number needed to harm 908: 834: 811: 791: 768: 733: 703: 606: 577: 421: 246:number needed to harm 232: 188: 144: 142:{\displaystyle I_{u}} 113: 111:{\displaystyle I_{e}} 86: 30: 2082:Cumulative incidence 846: 820: 800: 796:, exposure noted by 777: 757: 715: 618: 589: 436: 340: 201: 157: 126: 95: 55: 1989:Observational study 1921:Real world evidence 1875:experimental design 1316:Total subjects (S) 1255: 989:Total subjects (S) 928: 2386:Medical statistics 2275:Risk–benefit ratio 2242:First-in-man study 2192:Case fatality rate 2033:Case–control study 2007:Longitudinal study 1253: 926: 917:Numerical examples 903: 829: 806: 786: 763: 728: 698: 601: 572: 416: 252:Usage in reporting 227: 183: 139: 108: 81: 33: 2368: 2367: 2316:Survivorship bias 2280:Systematic review 2247:Multicenter trial 2210: 2209: 2200:Likelihood-ratios 2172:Clinical endpoint 2140:Population impact 2094:Period prevalence 1871:Clinical research 1829:978-0-00-724019-7 1624:978-0-19-939006-9 1570: 1569: 1391: 1390: 1246: 1245: 1193: 1064: 1063: 809:{\displaystyle E} 766:{\displaystyle D} 567: 565: 511: 411: 379: 331: 330: 299:Experimental (E) 283:contingency table 45:attributable risk 16:(Redirected from 2393: 2215:Trial/test types 2090:Point prevalence 2068: 2011:Ecological study 1994:EBM II-2 to II-3 1965:Open-label trial 1960:Blind experiment 1936:Controlled study 1864: 1857: 1850: 1841: 1834: 1833: 1815: 1809: 1808: 1776: 1770: 1769: 1759: 1748:10.1136/bmj.c869 1727: 1721: 1720: 1714: 1706: 1680: 1671: 1670: 1668: 1667: 1638: 1629: 1628: 1600: 1393: 1352:Event rate (ER) 1256: 1191: 1066: 1025:Event rate (ER) 929: 912: 910: 909: 904: 838: 836: 835: 830: 815: 813: 812: 807: 795: 793: 792: 787: 772: 770: 769: 764: 737: 735: 734: 729: 727: 726: 707: 705: 704: 699: 694: 693: 639: 638: 610: 608: 607: 602: 581: 579: 578: 573: 568: 566: 564: 563: 562: 534: 517: 512: 510: 509: 508: 480: 463: 461: 425: 423: 422: 417: 412: 410: 393: 385: 380: 378: 361: 353: 288: 265:Authors such as 236: 234: 233: 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2359:List of topics 2355: 2348: 2340: 2337: 2336: 2334: 2333: 2328: 2323: 2318: 2313: 2311:Selection bias 2307: 2305: 2301: 2300: 2298: 2297: 2292: 2287: 2282: 2277: 2271: 2269: 2263: 2262: 2260: 2259: 2254: 2249: 2244: 2239: 2234: 2232:Animal testing 2229: 2224: 2218: 2216: 2212: 2211: 2208: 2207: 2184:Mortality rate 2170: 2168: 2162: 2161: 2144: 2142: 2136: 2135: 2106: 2104: 2098: 2097: 2076: 2074: 2065: 2059: 2058: 2056: 2055: 2050: 2045: 2040: 2030: 2029: 2028: 2023: 2013: 1999: 1997: 1985: 1984: 1982: 1981: 1980: 1979: 1977:Platform trial 1969: 1968: 1967: 1962: 1957: 1946: 1944: 1932: 1931: 1929: 1928: 1923: 1918: 1913: 1908: 1903: 1902: 1901: 1896: 1889:Clinical trial 1885: 1883: 1879: 1878: 1869: 1867: 1866: 1859: 1852: 1844: 1836: 1835: 1828: 1810: 1771: 1722: 1693: 1672: 1659: 1630: 1623: 1594: 1593: 1591: 1588: 1587: 1586: 1581: 1574: 1571: 1568: 1567: 1564: 1545: 1542: 1536: 1535: 1532: 1518: 1515: 1512: 1506: 1505: 1502: 1483: 1480: 1476: 1475: 1472: 1463: 1460: 1453: 1452: 1449: 1438: 1435: 1429: 1428: 1425: 1416: 1413: 1409: 1408: 1405: 1402: 1397: 1389: 1388: 1385: 1384:= 0.4, or 40% 1369: 1368:= 0.5, or 50% 1353: 1349: 1348: 1345: 1331: 1317: 1313: 1312: 1309: 1303: 1297: 1293: 1292: 1289: 1283: 1277: 1273: 1272: 1269: 1263: 1260: 1250: 1247: 1244: 1243: 1240: 1221: 1218: 1212: 1211: 1208: 1194: 1188: 1182: 1181: 1178: 1160: 1157: 1151: 1150: 1147: 1138: 1135: 1128: 1127: 1124: 1113: 1110: 1104: 1103: 1100: 1091: 1088: 1082: 1081: 1078: 1075: 1070: 1062: 1061: 1058: 1057:= 0.4, or 40% 1042: 1041:= 0.1, or 10% 1026: 1022: 1021: 1018: 1004: 990: 986: 985: 982: 976: 970: 966: 965: 962: 956: 950: 946: 945: 942: 936: 933: 923: 922:Risk reduction 920: 918: 915: 914: 913: 902: 899: 896: 893: 890: 887: 884: 881: 878: 875: 872: 869: 866: 863: 860: 857: 854: 851: 828: 825: 805: 785: 782: 762: 750: 747: 740:standard score 725: 721: 709: 708: 697: 692: 688: 684: 681: 678: 675: 672: 669: 666: 663: 660: 657: 654: 651: 648: 645: 642: 637: 634: 631: 627: 623: 600: 597: 594: 583: 582: 571: 561: 557: 553: 550: 547: 544: 541: 538: 533: 530: 527: 524: 521: 515: 507: 503: 499: 496: 493: 490: 487: 484: 479: 476: 473: 470: 467: 459: 456: 453: 450: 447: 444: 441: 427: 426: 415: 409: 406: 403: 400: 397: 392: 389: 383: 377: 374: 371: 368: 365: 360: 357: 351: 348: 345: 329: 328: 325: 322: 318: 317: 314: 311: 307: 306: 300: 296: 295: 292: 278: 275: 271:natural number 253: 250: 224: 220: 216: 211: 207: 180: 176: 172: 167: 163: 136: 132: 105: 101: 78: 74: 70: 65: 61: 24: 14: 13: 10: 9: 6: 4: 3: 2: 2398: 2387: 2384: 2382: 2379: 2378: 2376: 2361: 2360: 2356: 2354: 2353: 2349: 2347: 2346: 2342: 2341: 2338: 2332: 2329: 2327: 2324: 2322: 2319: 2317: 2314: 2312: 2309: 2308: 2306: 2302: 2296: 2293: 2291: 2290:Meta-analysis 2288: 2286: 2283: 2281: 2278: 2276: 2273: 2272: 2270: 2268: 2264: 2258: 2257:Vaccine trial 2255: 2253: 2252:Seeding trial 2250: 2248: 2245: 2243: 2240: 2238: 2235: 2233: 2230: 2228: 2225: 2223: 2220: 2219: 2217: 2213: 2205: 2201: 2197: 2193: 2189: 2185: 2181: 2177: 2173: 2169: 2167: 2163: 2159: 2155: 2151: 2147: 2143: 2141: 2137: 2133: 2129: 2125: 2121: 2117: 2113: 2109: 2105: 2103: 2099: 2095: 2091: 2087: 2083: 2079: 2075: 2073: 2069: 2066: 2064: 2060: 2054: 2051: 2049: 2046: 2044: 2041: 2038: 2034: 2031: 2027: 2024: 2022: 2021:Retrospective 2019: 2018: 2017: 2014: 2012: 2008: 2004: 2001: 2000: 1998: 1995: 1990: 1986: 1978: 1975: 1974: 1973: 1970: 1966: 1963: 1961: 1958: 1956: 1953: 1952: 1951: 1948: 1947: 1945: 1942: 1941:EBM I to II-1 1937: 1933: 1927: 1924: 1922: 1919: 1917: 1914: 1912: 1909: 1907: 1904: 1900: 1897: 1895: 1892: 1891: 1890: 1887: 1886: 1884: 1880: 1876: 1872: 1865: 1860: 1858: 1853: 1851: 1846: 1845: 1842: 1831: 1825: 1821: 1814: 1811: 1806: 1802: 1798: 1794: 1790: 1786: 1782: 1775: 1772: 1767: 1763: 1758: 1753: 1749: 1745: 1741: 1737: 1733: 1726: 1723: 1718: 1712: 1704: 1700: 1696: 1694:9780199754557 1690: 1686: 1679: 1677: 1673: 1662: 1660:9780199976720 1656: 1652: 1648: 1644: 1637: 1635: 1631: 1626: 1620: 1616: 1612: 1608: 1607: 1599: 1596: 1589: 1585: 1582: 1580: 1577: 1576: 1572: 1565: 1562: 1558: 1554: 1550: 1546: 1543: 1541: 1538: 1537: 1533: 1531: 1527: 1523: 1519: 1513: 1511: 1508: 1507: 1504:0.25, or 25% 1503: 1500: 1496: 1492: 1488: 1484: 1481: 1478: 1477: 1473: 1471: 1467: 1464: 1461: 1459:(risk ratio) 1458: 1457:Relative risk 1455: 1454: 1450: 1447: 1443: 1439: 1436: 1434: 1431: 1430: 1426: 1424: 1420: 1417: 1414: 1411: 1410: 1406: 1403: 1401: 1398: 1395: 1394: 1386: 1383: 1379: 1375: 1374: 1370: 1367: 1363: 1359: 1358: 1354: 1351: 1350: 1346: 1343: 1339: 1335: 1332: 1329: 1325: 1321: 1318: 1315: 1314: 1310: 1307: 1304: 1301: 1298: 1295: 1294: 1290: 1287: 1284: 1281: 1278: 1275: 1274: 1270: 1267: 1266:Control group 1264: 1261: 1258: 1257: 1249:Risk increase 1248: 1241: 1238: 1234: 1230: 1226: 1222: 1219: 1217: 1214: 1213: 1209: 1207: 1203: 1199: 1195: 1189: 1187: 1184: 1183: 1180:0.75, or 75% 1179: 1177: 1173: 1169: 1165: 1161: 1158: 1156: 1153: 1152: 1148: 1146: 1142: 1139: 1136: 1134:(risk ratio) 1133: 1132:Relative risk 1130: 1129: 1125: 1122: 1118: 1114: 1111: 1109: 1106: 1105: 1101: 1099: 1095: 1092: 1089: 1087: 1084: 1083: 1079: 1076: 1074: 1071: 1068: 1067: 1059: 1056: 1052: 1048: 1047: 1043: 1040: 1036: 1032: 1031: 1027: 1024: 1023: 1019: 1016: 1012: 1008: 1005: 1002: 998: 994: 991: 988: 987: 983: 980: 977: 974: 971: 968: 967: 963: 960: 957: 954: 951: 948: 947: 943: 940: 939:Control group 937: 934: 931: 930: 921: 916: 900: 894: 888: 885: 879: 876: 870: 867: 864: 858: 855: 852: 849: 842: 841: 840: 826: 803: 783: 760: 748: 746: 745: 741: 723: 719: 695: 690: 686: 682: 676: 673: 667: 664: 661: 658: 655: 652: 646: 643: 635: 632: 629: 625: 621: 614: 613: 612: 598: 595: 592: 569: 559: 551: 548: 545: 542: 539: 531: 528: 525: 522: 519: 513: 505: 497: 494: 491: 488: 485: 477: 474: 471: 468: 465: 457: 451: 448: 442: 439: 432: 431: 430: 413: 407: 404: 401: 398: 395: 390: 387: 381: 375: 372: 369: 366: 363: 358: 355: 349: 346: 343: 336: 335: 334: 326: 323: 320: 319: 315: 312: 309: 308: 304: 301: 298: 297: 289: 286: 284: 276: 274: 272: 268: 263: 260: 251: 249: 247: 243: 238: 222: 218: 214: 209: 205: 196: 178: 174: 170: 165: 161: 152: 134: 130: 121: 103: 99: 76: 72: 68: 63: 59: 50: 46: 42: 38: 29: 19: 2381:Epidemiology 2357: 2350: 2343: 2132:Hazard ratio 2107: 2016:Cohort study 1819: 1813: 1788: 1784: 1774: 1739: 1735: 1725: 1684: 1664:. Retrieved 1605: 1598: 1560: 1556: 1552: 1548: 1529: 1525: 1521: 1498: 1494: 1490: 1486: 1469: 1465: 1445: 1441: 1427:0.1, or 10% 1422: 1418: 1381: 1377: 1371: 1365: 1361: 1355: 1341: 1337: 1333: 1327: 1323: 1319: 1305: 1299: 1285: 1279: 1236: 1232: 1228: 1224: 1205: 1201: 1197: 1175: 1171: 1167: 1163: 1144: 1140: 1120: 1116: 1102:0.3, or 30% 1097: 1093: 1054: 1050: 1044: 1038: 1034: 1028: 1014: 1010: 1006: 1000: 996: 992: 978: 972: 958: 952: 752: 744:significance 710: 584: 428: 332: 280: 267:Ben Goldacre 264: 259:colon cancer 255: 239: 194: 150: 44: 40: 36: 34: 2326:Null result 2285:Replication 2180:Infectivity 2102:Association 2053:Case report 2043:Case series 2026:Prospective 1820:Bad Science 1276:Events (E) 949:Events (E) 310:Events (E) 41:excess risk 2375:Categories 2128:Odds ratio 2120:Risk ratio 2086:Prevalence 2072:Occurrence 2048:Case study 1666:2018-05-09 1590:References 1540:Odds ratio 1501:− 1 1216:Odds ratio 2188:Morbidity 2176:Virulence 2078:Incidence 1791:: 62–71. 1711:cite book 1703:750986180 1396:Variable 1259:Quantity 1069:Variable 932:Quantity 892:¬ 889:∣ 877:− 868:∣ 824:¬ 781:¬ 724:α 691:α 683:⋅ 662:± 636:α 633:− 599:α 596:− 526:⋅ 472:⋅ 382:− 277:Inference 215:− 171:− 120:incidence 69:− 2352:Glossary 2345:Category 2222:In vitro 2063:Measures 1882:Overview 1805:26199055 1766:20332511 1742:: c869. 1573:See also 1524:− 1489:− 1444:− 1421:− 1404:Formula 1200:− 1166:− 1119:− 1096:− 1077:Formula 91:, where 2227:In vivo 1757:2844943 738:is the 303:Control 291:  118:is the 1826:  1803:  1764:  1754:  1701:  1691:  1657:  1621:  1407:Value 1344:= 250 1330:= 150 1308:= 150 1288:= 100 1271:Total 1242:0.167 1080:Value 1017:= 250 1003:= 150 981:= 150 975:= 135 961:= 100 944:Total 711:where 294:Group 39:(RD), 2166:Other 1555:) / ( 1497:, or 1474:1.25 1440:1 / ( 1400:Abbr. 1302:= 75 1282:= 75 1231:) / ( 1210:0.75 1149:0.25 1126:3.33 1115:1 / ( 1073:Abbr. 955:= 15 43:, or 2005:vs. 1873:and 1824:ISBN 1801:PMID 1762:PMID 1717:link 1699:OCLC 1689:ISBN 1655:ISBN 1619:ISBN 1566:1.5 1534:0.2 1528:) / 1493:) / 1482:RRI 1437:NNH 1415:ARI 1347:400 1311:225 1291:175 1268:(C) 1204:) / 1170:) / 1159:RRR 1112:NNT 1090:ARR 1020:400 984:285 964:115 941:(C) 585:The 305:(C) 49:risk 35:The 1793:doi 1752:PMC 1744:doi 1740:340 1736:BMJ 1647:doi 1611:doi 1544:OR 1530:EER 1526:CER 1522:EER 1495:CER 1491:CER 1487:EER 1470:CER 1466:EER 1462:RR 1451:10 1446:CER 1442:EER 1423:CER 1419:EER 1373:CER 1357:EER 1220:OR 1206:CER 1202:EER 1198:CER 1172:CER 1168:EER 1164:CER 1145:CER 1141:EER 1137:RR 1121:EER 1117:CER 1098:EER 1094:CER 1046:CER 1030:EER 327:CN 324:EN 316:CE 313:EE 2377:: 2202:, 2198:, 2194:, 2190:, 2186:, 2182:, 2178:, 2174:, 2156:, 2152:, 2148:, 2130:, 2126:, 2122:, 2118:, 2114:, 2110:, 2092:, 2088:, 2084:, 2080:, 2009:, 1799:. 1789:54 1787:. 1783:. 1760:. 1750:. 1738:. 1734:. 1713:}} 1709:{{ 1697:. 1675:^ 1653:. 1633:^ 1617:. 1563:) 1561:CN 1559:/ 1557:CE 1553:EN 1551:/ 1549:EE 1514:AF 1499:RR 1468:/ 1448:) 1387:— 1382:CS 1380:/ 1378:CE 1376:= 1366:ES 1364:/ 1362:EE 1360:= 1342:CN 1340:+ 1338:CE 1336:= 1334:CS 1328:EN 1326:+ 1324:EE 1322:= 1320:ES 1306:CN 1300:EN 1286:CE 1280:EE 1239:) 1237:CN 1235:/ 1233:CE 1229:EN 1227:/ 1225:EE 1190:PF 1176:RR 1143:/ 1123:) 1060:— 1055:CS 1053:/ 1051:CE 1049:= 1039:ES 1037:/ 1035:EE 1033:= 1015:CN 1013:+ 1011:CE 1009:= 1007:CS 1001:EN 999:+ 997:EE 995:= 993:ES 979:CN 973:EN 959:CE 953:EE 285:: 248:. 237:. 2039:) 2035:( 1996:) 1992:( 1943:) 1939:( 1863:e 1856:t 1849:v 1832:. 1807:. 1795:: 1768:. 1746:: 1719:) 1705:. 1669:. 1649:: 1627:. 1613:: 1547:( 1520:( 1516:e 1485:( 1223:( 1196:( 1192:u 1162:( 901:. 898:) 895:E 886:D 883:( 880:P 874:) 871:E 865:D 862:( 859:P 856:= 853:D 850:R 827:E 804:E 784:D 761:D 720:z 696:, 687:z 680:) 677:D 674:R 671:( 668:E 665:S 659:D 656:R 653:= 650:) 647:D 644:R 641:( 630:1 626:I 622:C 593:1 570:. 560:3 556:) 552:N 549:C 546:+ 543:E 540:C 537:( 532:N 529:C 523:E 520:C 514:+ 506:3 502:) 498:N 495:E 492:+ 489:E 486:E 483:( 478:N 475:E 469:E 466:E 458:= 455:) 452:D 449:R 446:( 443:E 440:S 414:. 408:N 405:C 402:+ 399:E 396:C 391:E 388:C 376:N 373:E 370:+ 367:E 364:E 359:E 356:E 350:= 347:D 344:R 223:e 219:I 210:u 206:I 179:u 175:I 166:e 162:I 135:u 131:I 104:e 100:I 77:u 73:I 64:e 60:I 20:)

Index

Absolute risk reduction
Illustration of two groups: one exposed to a risk factor, and one unexposed. Exposed group has smaller risk of adverse outcome (RD = −0.25, ARR = 0.25).
risk
incidence
number needed to treat
number needed to harm
colon cancer
Ben Goldacre
natural number
contingency table
Control
standard score
significance
Control group
EER
CER
Abbr.
Absolute risk reduction
Number needed to treat
Relative risk
Relative risk reduction
Preventable fraction among the unexposed
Odds ratio
Control group
EER
CER
Abbr.
Number needed to harm
Relative risk
Attributable fraction among the exposed

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