Table 7

Cause specific mortality of male workers (n = 926) from a nickel-cadmium battery factory, by year of hire and by period from commencing employment, 1947–2000

Variable with levelsLung cancer†Non-malignant diseases of the respiratory system‡All causes
ObsExpSMRObsExpSMRObsExpSMR
*p<0.05.
†ICD-8 162, ICD-9 162.
‡ICD-8 460-519, ICD-9 460–519.
Year of hire
1947–562922.11313324.4136233204.9114
1957–661212.8941912.9148131121.6108
1967–7545.86995.81565857.5101
p value for heterogeneity0.350.920.69
p value for trend0.150.680.39
Period from commencing employment (y)
1–974.714964.61304843.2111
10–1969.563119.21209284.4109
20–291512.41211813.2136120117.6102
⩾301714.01212616.0163*162138.7117
Total4540.71116143.0142*422384.0110
p value for heterogeneity0.420.830.74
p value for trend0.720.410.65