Meta-Analysis
Copyright
©The Author(s) 2023. Published by Baishideng Publishing Group Inc. All rights reserved.
World J Meta-Anal. Jun 18, 2023; 11(5): 228-252
Published online Jun 18, 2023. doi: 10.13105/wjma.v11.i5.228
Table 1 Details of the 44 studies of lung cancer
Study IDa Ref. Country Designb Study Population Start year Year followed Agec Sexd Cases Adjuste Exclf Latencyg Endpoint NRRh ACE [51 ,52 ] US Cohort Regional 1995 10 18+ C 111 0, 8 0 0 Died 2 AEROBIC [53 ] US Cohort Regional 1974 29 20-84 M 232 0 0 0 Died 1 AGRICAN [54 ] France Cohort Regional 2005 6 18+ M, F 664 1 0 0 Diagnosed 2 AHS [55 ] US Cohort Pesticide workers 1993 18 NAR C 789 0, 8 x 0 Diagnosed 2 AMIANT [56 ] Poland Cohort Asbestos workers 2000 14 NAR C 110 0 0 0 Diagnosed 1 ARIC [57 ] US Cohort Regional 1987 19 45-64 M, F 470 0, 3 0 0 Diagnosed 4 ATP [22 ] Canada Cohort Regional 2001 16 35-69 M, F 210 0, 1, 7 0 0, x Diagnosed 10 BIOBANK [58 ] UK Cohort National 2006 10 40-73 M, F 1493 0 0 0 Diagnosed 2 BWHS [59 ] US Cohort National 1995 18 21-69 F 306 0, 1, 7 0 0 Diagnosed 3 CHANCES [21 ] Multiple Cohort International 1982 29 46-74 C 14041 0, 7 0 0 Diag, died 4 COAL [60 ] US Cohort Coal miners 1969 38 NAR M 568 7 0 0 Died 1 CPS-I [26 ] US Cohort National 1959 6 49+ M, F 1293 0, 1, 3 x 0 Died 6 CPS-II [26 ] US Cohort National 1982 6 49+ M, F 4957 0, 1, 3 x 0 Died 6 EPIC [31 ] Multiple Cohort International 1991 14 35-70 M 2995 0, 5 x 0 Diagnosed 6 [32 ] 8 30-70 M, F 2995 7 0 0 Diagnosed 2 ESTHER [61 ] Germany Nested CC Regional 2000 17 50-75 C 143 0 0 0 Diagnosed 1 FRAMING [62 ] US Cohort Regional 1954 59 NAR C 284 0, 1 0 0 Diagnosed 2 HBC [63 ] Finland Cohort Regional 2001 5 55-65 C 121 1 0 0 Diagnosed 1 HPFS [64 ] US Nested CC Medical workers 1986 14 40-75 M 210 0, 2, 4 0 0 Diagnosed 3 JP8 [23 ] Japan Cohort National 1984 25 35+ M, F 4478 0, 2, 5 x 0, x Diagnosed 8 JPHC [65 ] Japan Cohort National 1990 21 40-69 M, F 1663 0 x 0 Diagnosed 2 [66 ] 3 40-69 M, F 1663 0, 10 x 0 Died 4 KAISER [67 ] US Cohort Regional 1978 30 NAR C 1415 0, 6 0 0 Diagnosed 2 KRIS [68 ] Lithuania Cohort Regional 1972 36 40-59 M 343 0, 1, 4 0 x Diagnosed 3 LSS [69 ] Japan Cohort Atomic bomb survivors 1950 59 5+ M, F 1597 0 x 0 Diagnosed 2 MWOMEN [24 ] UK Cohort National 1996 15 50-69 F 6331 0, 10 x 0, x Died 3 NHANES [70 ] US Cohort National 1988 18 40+ C 269 0 0 0 Died 1 NHIS [71 ] US Cohort National 1987 28 18-84 C 7420 0, 11 0 0 Died 2 [72 ] 9 25-79 M, F 7420 0, 4 0 x Died 4 NHS [73 ] US Cohort Medical workers 1980 24 34-59 F 1729 1, 13 0 0 Died 2 [74 ] 24 38-63 F 1729 0 0 0 Diagnosed 1 NIHAARP [75 ] US Cohort Regional 1995 11 50-71 M, F 17846 0, 5 x x Diagnosed 4 [76 ] 16 50-71 C 17846 0 0 0 Diagnosed 1 NLCS [29 ] Netherlands Nested CC National 1986 17 55-69 C 3355 0 0 0 Diagnosed 3 [30 ] 20 55-69 M, F 3355 0 0 0 Diagnosed 2 NLMS [28 ] US Cohort National 1985 26 35-80 C 3890 0, 1, 5 x 0 Died 8 NLST [77 ] US Cohort Construction workers 1998 18 NAR M 352 0, 2 0 0 Died 2 NONMET [78 ] US Nested CC Non-metal miners 1947 50 NAR M 198 0, 7 0 0 Died 2 NOWAC [79 ] Norway Cohort National 1991 24 31-70 F 1507 0, 1, 3 0 0 Diagnosed 3 PLCO [80 ] US Cohort Regional 1993 15 55-74 C 1040 0 0 0 Died 1 [81 ] 15 55-74 F 1040 6 0 0 Died 1 QRESEAR [82 ] UK Cohort National 1998 15 25-84 M, F 32187 0, 6 0 0 Diagnosed 4 SCCS [83 ] US Nested CC Regional 2002 14 40-79 M, F 1334 0 0 0 Diagnosed 2 [84 ] 7 40-79 C 1334 10 0 0 Diagnosed 1 SHEETME [85 ] Multiple Cohort Sheet metal workers 1986 24 NAR M 808 0 0 0 Died 1 THIN [86 ] UK Cohort National 2000 12 30-99 C 1015 0 0 0 Diagnosed 1 THREEC [20 ] Norway Cohort Regional 1974 33 20-49 M 858 0, 10 0, x 0 Died 6 [87 ] 35 35-49 M, F 858 0 0 x Died 2 USA5 [26 ] US Cohort National 1986 24 45+ M, F 11420 0, 1, 3 0 0 Died 6 VETERAN [88 ] US Cohort Regional 1987 28 21-89 M 105 0 0 0 Diagnosed 1 VITAL [89 ] US Cohort Regional 2000 7 50-76 C 797 0 0 0 Diagnosed 1 VLAGT [27 ] Netherlands Cohort Regional 1965 43 20-65 M, F 275 0, 3, 4 0 0 Died 4 WHI [90 ] US Cohort National 1993 16 50-79 F 901 0, 1, 15 0 0 Diagnosed 3
Table 2 Details of the 18 studies of chronic obstructive pulmonary disease
Study IDa Ref. Country Study Population Start year Year followed Ageb Sexc Cases COPD definitiond Adjuste Exclf Latencyg Endpoint NRRh CPRD [91 ] UK Regional 2003 4 40-89 C 14446 3 0 0 0 Diagnosed 1 CPS-I [26 ] US National 1959 6 49+ M, F 782 DU 0, 1, 3 0, x 0 Died 6 CPS-II [26 ] US National 1982 6 49+ M, F 2128 DU 0, 1, 3 0, x 0 Died 6 Finn Twins [92 ] Finland National 1975 27 17+ C 511 5 0, 2 0 0 Diagnosed 2 JACC [93 ] Japan National 1988 20 40-79 M, F 285 6 0, 1, 9 0 0 Died 6 KAISER [94 ] US Regional 1978 28 NAR C 778 4 0, 6 0 0 Diagnosed 2 MWOMEN [24 ] UK National 1996 15 50-69 F 1910 2 0, 5 x 0 Died 3 NHS-HPFS [95 ] US Regional 1976 24 30-75 C 832 1 0 0 0 Diagnosed 1 NIH-AARP [96 ] US Regional 1995 11 50-70 C 3648 1 0 0 0 Diagnosed 1 NLMS [28 ] US National 1985 26 35-80 C 2091 2 0, 1, 5 x 0 Died 9 NOWACi [97 ] Norway National 1991 17 26-71 F 68 2 1, 6 x 0 Died 2 PATH [98 ] US National 2013 3 18+ C 319 1 0 0 0 Diagnosed 1 SMC [99 ] Sweden Regional 1997 17 48-83 F 1495 8 0 x x Diagnosed 1 THIN [86 ] UK National 2000 12 30-99 C 3901 9 0 0 0 Diagnosed 1 USA5 [26 ] US Regional 1986 24 50+ M, F 9246 DU 0, 1, 3 0, x 0 Died 6 [100 ] 25 50+ M, F 9246 2 0, 5 0, x 0 Died 4 VLAGT [27 ] Netherlands Regional 1965 43 NAR M, F 313 7 0, 3 0, x 0 Died 4 WHI [25 ] US Regional 1993 22 50-79 F 4959 1 0 x 0 Diagnosed 1 WHS [101 ] US Regional 1993 11 45+ F 1604 1 0 x 0 Diagnosed 1
Table 3 Lung cancer and current vs never cigarette smoking – results from random effects meta-analyses
Full output table Factor Level No. of RRs No. of studies RR (95%CI) Heterogeneity test by level (NS = P ≥ 0.1) and trend if relevant All 62 44 12.14 (10.30-14.30) P < 0.0014 Sex Combined 12 12 12.93 (10.55-15.84) Males 26 26 12.95 (9.82-17.08) Females 24 24 11.32 (8.46-15.15) NS 5 Region N. America 34 26 15.15 (12.77-17.96) Europe 21 14 12.30 (9.77-15.49) Japan 6 3 3.61 (2.87-4.55) Multi 1 1 13.10 (9.91-17.32) P < 0.0016 Study population International 3 2 14.45 (6.85-30.50) National 25 16 10.26 (8.03-13.12) Regional 24 17 16.27 (13.39-19.77) Specific 10 9 9.71 (5.41-17.42) P < 0.057 Year of start of baseline < 1980 14 10 8.65 (5.83-12.83) 1980-89 19 13 12.92 (9.83-16.98) 1990-99 16 12 13.45 (9.76-18.53) 2000+ 13 9 14.38 (11.40-18.15) NS trend P < 0.1 8 Number of cases < 500 19 16 11.90 (9.55-14.83) 500-1999 24 17 11.68 (8.65-15.75) 2000+ 19 11 12.76 (9.99-16.31) NS trend NS 9 Exclusive cigarettes No 45 35 13.47 (11.55-15.72) Yes 17 11 9.50 (6.61-13.64) P < 0.110 Latency rule applied No 51 38 11.93 (9.97-14.28) Yes 11 7 13.13 (8.69-19.83) NS 11 Study design Cohort 55 39 12.35 (10.35-14.73) Nested case control 7 5 10.41 (8.04-13.48) NS 12, 13 Lowest age considered < 30 15 10 11.30 (7.37-17.33) 30-39 11 8 11.41 (7.80-16.70) 40-48 14 9 13.29 (9.15-19.30) 49+ 14 10 13.62 (10.22-18.16) NS trend without Missing 8 8 10.79 (7.64-15.23) Missing NS 14 Year of follow-up < 10 11 7 12.63 (8.49-18.80) 10- < 15 11 8 16.05 (12.48-20.65) 15- < 20 14 11 16.05 (12.69-20.30) 20- < 30 15 11 9.08 (6.26-13.15) 30+ 11 8 9.57 (6.01-15.26) P < 0.05 trend P < 0.115 Endpoint Died 23 17 14.85 (11.99-18.38) Diagnosed 39 27 10.82 (8.61-13.60) P < 0.0516 Number of adjustment factors None 20 15 9.65 (7.13-13.05) Age only 4 3 11.80 (5.24-26.56) More 38 28 13.68 (11.46-16.34) NS trend P < 0.1
Table 4 Chronic obstructive pulmonary disease and current vs never cigarette smoking – results from random effects meta-analyses
Full output table Factor Level No. of RRs No. of Studies RR (95%CI) Heterogeneity test by level (NS = P ≥ 0.1) and trend if relevant All 23 18 9.19 (6.97-12.13) P < 0.0014 Sex Combined 8 8 8.91 (7.05-11.26) Males 5 5 9.56 (4.22-21.64) Females 10 10 9.33 (4.91-17.71) NS 5 Region N. America 13 10 8.91 (5.73-13.84) Europe 8 7 10.63 (6.93-16.29) Japan 2 1 6.00 (2.97-12.12) NS 6 Study population National 12 9 8.90 (6.47-12.24) Regional 11 9 9.51 (6.16-14.66) NS 7 Year of start < 1988 12 8 10.24 (7.26-14.45) of baseline 1988+ 11 10 8.14 (5.78-11.47) NS 8 Number of cases < 1000 11 8 7.42 (5.65-9.74) 1000+ 12 10 10.67 (7.26-15.68) NS 9 Exclusive cigarettes No 13 12 9.02 (6.78-12.00) Yes 10 10 9.48 (5.25-17.14) NS 10 Latency rule applied No 21 16 8.41 (6.38-11.09) Yes 2 2 21.67 (7.74-60.66) P < 0.111, 12 Lowest age considered < 34 5 5 8.36 (7.13-9.80) 35-45 5 4 6.26 (4.31-9.08) 46-49 5 3 7.92 (5.41-11.58) 50+ 5 4 15.36 (5.95-39.66) NS trend without Missing 3 2 9.33 (5.00-17.40) Missing NS 13 Year of follow-up < 10 6 4 6.85 (5.24-8.94) 10- < 20 6 6 11.32 (6.67-19.20) 20- < 30 9 7 10.11 (5.21-19.60) 30+ 2 1 6.29 (3.73-10.59) NS trend NS 14 COPD definitiona Excl. Bronch 6 5 17.45 (8.35-36.44) Incl. Bronch 5 3 7.83 (4.60-13.35) Other 12 10 7.15 (5.19-9.84) P < 0.115 Endpoint Died 13 8 10.95 (7.42-16.15) Diagnosed 10 10 7.49 (5.63-9.95) NS 16 Number of adjustment factors None 8 8 6.96 (5.09-9.53) More 15 10 10.83 (7.67-15.29) P < 0.1