TABLE 1.

Characteristics of the Baseline Cohort, Study Participants With Complete Data, and the Imputed Sample: The Whitehall II Study, London, UK, 1985–1999

	Baseline Cohort (Maximum n = 10 308)		Complete Cases (n = 3703)a		Imputed Sample (n = 9425)b
Baseline Characteristic	No.	% or Mean (SD)	No.	% or Mean (SD)	Mean No.	% or Mean (SD)
Gender
Women	3413	33.1	1043	28.2	3039	32.2
Men	6895	66.9	2660	71.2	6386	67.8
Age, y	10 308	44.4 (6.9)	3703	44.3 (5.9)	9425	44.4 (6.0)
Ethnicity
White	9181	89.1	3403	91.9	8510	90.3
Non-White	1127	10.9	300	8.1	915	9.7
Marital status
Married or cohabiting	7608	74.1	2879	77.7	7086	75.2
Other	2662	25.9	824	22.3	2339	24.8
Occupational position
Highest grade	3028	29.4	1162	31.4	2821	29.9
Intermediate grade	4943	50.0	1950	52.7	4582	48.6
Lowest grade	2337	22.6	591	15.9	2022	21.5
Smoking status
Never	5062	49.5	1929	52.1	4650	48.6
Ex-smoker	3274	32.0	1247	33.7	3046	32.6
Current	1883	18.4	527	14.2	1657	17.7
Moderate physical activity, hr/wk	9929	2.9 (3.5)	3703	3.0 (3.5)	9425	2.9 (3.5)
Vigorous physical activity, hr/wk	9919	1.0 (1.9)	3703	1.0 (1.8)	9425	1.0 (1.9)
Fruit and vegetable consumption
Daily	5998	58.4	2107	56.9	5480	58.1
Not daily	2744	41.6	1596	43.1	3945	41.9
Common mental disorder
No	7445	73.1	2711	73.2	6827	73.0
Yes	2744	26.9	992	26.8	2521	27.0
Negative aspects of close relationships	7384	2.8 (2.4)	3703	2.8 (2.3)	9425	2.8 (2.4)
Negative aspects of close relationships (repeated)	7727	2.8 (2.3)	3231	2.9 (2.3)	9425	2.9 (2.4)

^aParticipants with no missing data on exposure, outcome, or covariate variables.

^bMultiple imputed sample of participants with at least 1 measurement of negative aspects of close relationships at phase 1 or 2.