Table 2

 Stratification as a means of adjusting rate comparisons for age: death rates among male pottery workers versus all males in England and Wales, 1986–90

Age (y)Male pottery workersEngland and Wales male population
P-yearsCa lung deathsDeath rate/1000/yDeath rate/1000/yRate ratioWeight*
(1)(2)(1)/(2)
*Weights were chosen to minimise the standard error of the weighted mean (see text).
55–594334133.01.32.30.346
60–642200115.02.81.80.378
65–69109687.34.11.80.276
Total763032