Table 3.

HRs (95% CI) for all-cause mortality according to quartiles of intellectual ability test scores and father's occupational status

	Number of deaths/subjects	Manual worker	Number of deaths/subjects	Middle class
Verbal
Lowest	99/501	2.1 (1.4 to 3.0)	27/140	2.1 (1.3 to 3.4)
2	100/515	2.0 (1.4 to 2.9)	32/203	1.6 (1.0 to 2.6)
3	64/391	1.7 (1.2 to 2.6)	25/256	1.0 (0.6 to 1.7)
Highest	36/314	1.3 (0.8 to 2.0)	39/414	1.0 (Referent)
Per 1 unit lower test z score		1.16 (1.02 to 1.30)		1.38 (1.16 to 1.65)
Adjusted for educational attainment		1.07 (0.94 to 1.22)		1.29 (1.05 to 1.59)
Visuospatial
Lowest	98/506	3.1 (1.9 to 5.1)	33/155	3.5 (2.0 to 6.2)
2	84/425	3.2 (1.9 to 5.2)	31/194	2.7 (1.5 to 4.7)
3	80/490	2.6 (1.6 to 4.3)	39/346	1.8 (1.0 to 3.1)
Highest	37/300	2.0 (1.1 to 3.4)	21/319	1.0 (Referent)
Per 1 unit lower test z score		1.17 (1.04 to 1.31)		1.53 (1.29 to 1.81)
Adjusted for educational attainment		1.08 (0.95 to 1.22)		1.47 (1.21 to 1.79)
Arithmetic
Lowest	106/523	2.5 (1.6 to 3.8)	32/161	2.6 (1.5 to 4.3)
2	80/459	2.2 (1.4 to 3.4)	28/207	1.7 (1.0 to 2.8)
3	68/427	2.0 (1.3 to 3.2)	34/286	1.6 (0.9 to 2.6)
Highest	42/302	1.7 (1.1 to 2.8)	29/356	1.0 (Referent)
Per 1 unit lower test z score		1.13 (1.00 to 1.26)		1.36 (1.13 to 1.63)
Adjusted for educational attainment		1.03 (0.91 to 1.16)		1.23 (0.99 to 1.53)

p for interaction between childhood socioeconomic status and intellectual ability scores 0.06 for verbal test score, 0.002 for visuospatial test score and 0.02 for arithmetic test score, adjusted for age, year, height and body mass index and testing and childhood socioeconomic status.

Analyses are stratified for year of birth and adjusted for age, year, height and body mass index and testing and childhood socioeconomic status.