Meta-Analysis
Copyright ©The Author(s) 2023.
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 CohortRegional19951018+C1110, 800Died2
AEROBIC[53]USCohortRegional19742920-84M232000Died1
AGRICAN[54]FranceCohortRegional2005618+M, F664100Diagnosed2
AHS[55]USCohortPesticide workers199318NAR C7890, 8x0Diagnosed2
AMIANT[56]PolandCohortAsbestos workers200014NARC110000Diagnosed1
ARIC[57]USCohortRegional19871945-64M, F4700, 300Diagnosed 4
ATP[22]CanadaCohortRegional20011635-69M, F2100, 1, 700, xDiagnosed10
BIOBANK[58]UKCohortNational20061040-73M, F1493000Diagnosed2
BWHS[59]USCohortNational19951821-69F3060, 1, 700Diagnosed3
CHANCES[21]MultipleCohortInternational19822946-74C140410, 700Diag, died4
COAL[60]USCohortCoal miners196938NARM568700Died1
CPS-I[26]USCohortNational1959649+M, F12930, 1, 3x0Died6
CPS-II[26]US CohortNational1982649+M, F49570, 1, 3x0Died6
EPIC[31]MultipleCohortInternational19911435-70M29950, 5x0Diagnosed6
[32]830-70M, F2995700Diagnosed2
ESTHER[61]GermanyNested CCRegional20001750-75C143000Diagnosed1
FRAMING[62]USCohortRegional195459NARC2840, 100Diagnosed2
HBC[63]FinlandCohortRegional2001555-65C121100Diagnosed1
HPFS[64]USNested CCMedical workers19861440-75M2100, 2, 400Diagnosed3
JP8[23]JapanCohortNational19842535+M, F44780, 2, 5x0, xDiagnosed8
JPHC[65]JapanCohortNational19902140-69M, F16630x0Diagnosed2
[66]340-69M, F16630, 10x0Died4
KAISER[67]USCohortRegional197830NARC14150, 600Diagnosed2
KRIS[68]LithuaniaCohortRegional19723640-59M3430, 1, 40xDiagnosed3
LSS[69]JapanCohortAtomic bomb survivors1950595+M, F15970x0Diagnosed2
MWOMEN[24]UKCohortNational19961550-69F63310, 10x0, xDied3
NHANES[70]USCohortNational19881840+C269000Died1
NHIS[71]USCohortNational19872818-84C74200, 1100Died2
[72]925-79M, F74200, 40xDied4
NHS[73]USCohortMedical workers19802434-59F17291, 1300Died2
[74]2438-63F1729000Diagnosed1
NIHAARP[75]USCohortRegional19951150-71M, F178460, 5xxDiagnosed4
[76]1650-71C17846000Diagnosed1
NLCS[29]NetherlandsNested CCNational19861755-69C3355000Diagnosed3
[30]2055-69M, F3355000Diagnosed2
NLMS[28]US CohortNational19852635-80C38900, 1, 5x0Died8
NLST[77]USCohortConstruction workers199818NARM3520, 200Died2
NONMET[78]USNested CCNon-metal miners194750NARM1980, 700Died2
NOWAC[79]NorwayCohortNational19912431-70F15070, 1, 300Diagnosed3
PLCO[80]USCohortRegional19931555-74C1040000Died1
[81]1555-74F1040600Died1
QRESEAR[82]UKCohortNational19981525-84M, F321870, 600Diagnosed4
SCCS[83]USNested CCRegional20021440-79M, F1334000Diagnosed2
[84]740-79C13341000Diagnosed1
SHEETME[85]MultipleCohortSheet metal workers198624NARM808000Died1
THIN[86]UKCohortNational20001230-99C1015000Diagnosed1
THREEC[20]NorwayCohortRegional19743320-49M8580, 100, x0Died6
[87]3535-49M, F85800xDied2
USA5[26]USCohortNational19862445+M, F114200, 1, 300Died6
VETERAN[88]USCohortRegional19872821-89M105000Diagnosed1
VITAL[89]US CohortRegional2000750-76C797000Diagnosed1
VLAGT[27]NetherlandsCohortRegional19654320-65M, F2750, 3, 400Died4
WHI[90]USCohortNational19931650-79F9010, 1, 1500Diagnosed3
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]UKRegional2003440-89C144463 000Diagnosed1
CPS-I[26]USNational1959649+M, F782DU0, 1, 30, x0Died6
CPS-II[26]USNational1982649+M, F2128DU0, 1, 30, x0Died6
Finn Twins[92]FinlandNational19752717+C51150, 200Diagnosed2
JACC[93]JapanNational19882040-79M, F28560, 1, 900Died6
KAISER[94]USRegional197828NARC77840, 600Diagnosed2
MWOMEN[24]UKNational19961550-69F191020, 5x0Died3
NHS-HPFS[95]USRegional19762430-75C8321000Diagnosed1
NIH-AARP[96]USRegional19951150-70C36481000Diagnosed1
NLMS[28]USNational19852635-80C209120, 1, 5x0Died9
NOWACi[97]NorwayNational19911726-71F6821, 6x0Died2
PATH[98]USNational2013318+C3191000Diagnosed1
SMC[99]SwedenRegional19971748-83F149580xxDiagnosed1
THIN[86]UKNational20001230-99C39019000Diagnosed1
USA5[26]USRegional19862450+M, F9246DU0, 1, 30, x0Died6
[100]2550+M, F924620, 50, x0Died4
VLAGT[27]NetherlandsRegional196543NARM, F31370, 30, x0Died4
WHI[25]USRegional19932250-79F495910x0Diagnosed1
WHS[101]USRegional19931145+F160410x0Diagnosed1
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
All624412.14 (10.30-14.30)P < 0.001
4SexCombined121212.93 (10.55-15.84)
Males262612.95 (9.82-17.08)
Females242411.32 (8.46-15.15)NS
5RegionN. America342615.15 (12.77-17.96)
Europe211412.30 (9.77-15.49)
Japan633.61 (2.87-4.55)
Multi1113.10 (9.91-17.32)P < 0.001
6Study populationInternational3214.45 (6.85-30.50)
National251610.26 (8.03-13.12)
Regional241716.27 (13.39-19.77)
Specific1099.71 (5.41-17.42)P < 0.05
7Year of start of baseline< 198014108.65 (5.83-12.83)
1980-89191312.92 (9.83-16.98)
1990-99161213.45 (9.76-18.53)
2000+13914.38 (11.40-18.15)NS trend P < 0.1
8Number of cases< 500191611.90 (9.55-14.83)
500-1999241711.68 (8.65-15.75)
2000+191112.76 (9.99-16.31)NS trend NS
9Exclusive cigarettesNo453513.47 (11.55-15.72)
Yes17119.50 (6.61-13.64)P < 0.1
10Latency rule appliedNo513811.93 (9.97-14.28)
Yes11713.13 (8.69-19.83)NS
11Study designCohort553912.35 (10.35-14.73)
Nested case control7510.41 (8.04-13.48)NS
12, 13Lowest age considered< 30151011.30 (7.37-17.33)
30-3911811.41 (7.80-16.70)
40-4814913.29 (9.15-19.30)
49+141013.62 (10.22-18.16)NS trend without
Missing8810.79 (7.64-15.23)Missing NS
14Year of follow-up< 1011712.63 (8.49-18.80)
10- < 1511816.05 (12.48-20.65)
15- < 20141116.05 (12.69-20.30)
20- < 3015119.08 (6.26-13.15)
30+1189.57 (6.01-15.26)P < 0.05 trend P < 0.1
15EndpointDied231714.85 (11.99-18.38)
Diagnosed392710.82 (8.61-13.60)P < 0.05
16Number of adjustment factorsNone20159.65 (7.13-13.05)
Age only4311.80 (5.24-26.56)
More382813.68 (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
All23189.19 (6.97-12.13)P < 0.001
4SexCombined888.91 (7.05-11.26)
Males559.56 (4.22-21.64)
Females10109.33 (4.91-17.71)NS
5RegionN. America13108.91 (5.73-13.84)
Europe8710.63 (6.93-16.29)
Japan216.00 (2.97-12.12)NS
6Study populationNational1298.90 (6.47-12.24)
Regional1199.51 (6.16-14.66)NS
7Year of start< 198812810.24 (7.26-14.45)
of baseline1988+11108.14 (5.78-11.47)NS
8Number of cases< 10001187.42 (5.65-9.74)
1000+121010.67 (7.26-15.68)NS
9Exclusive cigarettesNo13129.02 (6.78-12.00)
Yes10109.48 (5.25-17.14)NS
10Latency rule appliedNo21168.41 (6.38-11.09)
Yes2221.67 (7.74-60.66)P < 0.1
11, 12Lowest age considered< 34558.36 (7.13-9.80)
35-45546.26 (4.31-9.08)
46-49537.92 (5.41-11.58)
50+5415.36 (5.95-39.66)NS trend without
Missing329.33 (5.00-17.40)Missing NS
13Year of follow-up< 10646.85 (5.24-8.94)
10- < 206611.32 (6.67-19.20)
20- < 309710.11 (5.21-19.60)
30+216.29 (3.73-10.59)NS trend NS
14COPD definitionaExcl. Bronch6517.45 (8.35-36.44)
Incl. Bronch537.83 (4.60-13.35)
Other12107.15 (5.19-9.84)P < 0.1
15EndpointDied13810.95 (7.42-16.15)
Diagnosed10107.49 (5.63-9.95)NS
16Number of adjustment factorsNone886.96 (5.09-9.53)
More151010.83 (7.67-15.29)P < 0.1