Table 2

Relative risk of death from lung cancer: studies comparing frequent chest radiographic screening with less frequent screening.

No randomisedNo of lung cancer deaths
StudyInterventionControlInterventionControlRelative risk (95% CI)
*Results were identical with random effects and fixed effects models.
North London14297232531182681.03 (0.74 to 1.42)
Czech study16317131742472161.14 (0.96 to 1.36)
Mayo Lung Project4461845933373031.11 (0.95 to 1.28)
Kaiser Permanente185156555744421.13 (0.74 to 1.72)
Total42668386357106291.11 (1.00 to 1.23)*