Table 1.

Age-standardized characteristics of women at the 1992 baseline (N=42,913).

	Levels of depression symptoms
	Severe (n=6635)	High (n=8416)	Moderate (n=15,196)	Low or none (n=12,666)
Age, mean (SD)*	56.7 (7.1)	57.3 (7.1)	57.7 (7.0)	59.1 (6.9)
White race, %	98.1	98.2	98.3	98.1
Non-Hispanic ethnicity, %	99.1	99.3	99.3	99.4
Husband’s education level
- (NHS women not currently married), %	10.0	8.3	7.8	7.4
- Less than high school, %	6.5	6.1	5.4	4.7
- High school degree, %	37.9	36.9	36.5	36.0
- College degree, %	25.3	26.9	27.4	27.3
- Graduate degree, %	20.2	21.9	23.0	24.6
Family history of lung cancer, %	11.5	10.8	11.0	10.9
Second-hand smoking exposure during childhood, %	70.2	68.8	68.4	66.0
Parents’ occupation
- Both parents are dead, %	0.6	0.5	0.6	0.5
- Farmer, %	6.2	7.1	8.3	9.2
- Blue collar, %	23.6	22.8	21.4	20.6
- White collar, %	69.7	69.6	69.6	69.7
Smoking status
- Never smoker, %	40.7	43.0	46.2	49.6
- Former smoker, %	42.6	42.6	42.1	39.6
- Current smoker, %	16.7	14.3	11.8	10.8
Lifetime pack-years, mean (SD)	15.5 (20.8)	13.5 (19.4)	12.0 (18.2)	10.9 (17.3)
Diet quality (AHEI score; range: 0–110), mean (SD)	51.4 (10.5)	52.3 (10.3)	53.0 (10.4)	53.7 (10.4)
150min/week or more of physical activity, %	31.5	36.4	41.4	44.9
Years of shiftwork
- Never, %	39.8	40.0	40.6	42.2
- 1–14 years, %	53.0	53.2	52.9	51.3
- 15–29 years, %	5.6	5.1	5.1	5.0
- 30 years or more, %	1.6	1.7	1.5	1.5

Values are means (SD) or medians (Q25, Q75) for continuous variables; percentages or ns or both for categorical variables, and are standardized to the age distribution of the study population. Values of polytomous variables may not sum to 100% due to rounding.

^*Value is not age adjusted