An exploration of the dynamic longitudinal relationship between mental health and alcohol consumption: a prospective cohort study

Table 1 Sample characteristics

	n	% or mean ± SD
MCS
Phase 5	6,330	51.1 ± 9.4
Phase 7	5,436	52.4 ± 8.8
Phase 9	5,195	53.8 ± 8.0
UK units of alcohol
Phase 5	6,330	14.6 ± 15.2
Phase 7	5,508	13.0 ± 13.0
Phase 9	5,215	11.1 ± 11.3
Age, years	6,330	55.8 ± 6.0
Sex
Male	4,594	72.6
Female	1,736	27.4
Total	6,330
Ethnicity
White	5,966	94.25
Non-white	364	5.75
Total	6,330
SES
High	2,852	45.3
Intermediate	2,731	43.4
Low	713	11.3
Total	6,296
Marital status
Married/cohabiting	4,861	79.6
Other	1,248	20.4
Total	6,109
Education
University	2,176	36.4
Post-secondary	1,648	27.5
Secondary	1,558	26.0
No qualifications	604	10.1
Total	5,986
Economic activity
Active	4,123	65.2
Inactive	2,203	34.8
Total	6,326
Current smoker
No	5,539	89.4
Yes	654	10.6
Total	6,193
Problem drinking (CAGE case)
No	5,531	89.0
Yes	684	11.0
Total	6,215
Physical activity
Active	3,405	54.16
Moderately active	1,057	16.78
Inactive	1,837	29.16
Total	6,299
Network score	6,053	7.3 ± 3.0
CHD
No	5,948	94.0
Yes	382	6.0
Total	6,330
Known diabetes
No	6,076	96.0
Yes	254	4.0
Total	6,330
Anti-depressant medication
No	6,149	97.3
Yes	171	2.7
Total	6,320
Poor self-reported physical health
No	4,821	76.2
Yes	1,509	23.8
Total	6,330
Long-standing illness
No	3,248	51.4
Yes	3,075	48.6
Total	6,323
Stroke
No	6,301	99.5
Yes	29	0.5
Total	6,330
TIA
No	6,287	99.3
Yes	43	0.7
Total	6,330
Resting heart rate > 80 bpm
No	4,969	88.15
Yes	668	11.85
Total	5,637
BMI	4,916	26.1 ± 3.9
Serum cholesterol, mmol/l	5,622	5.9 ± 1.1
Blood pressure, mmHg
Systolic	5,669	123.1 ± 16.4
Diastolic	5,669	77.6 ± 10.6

BMI, body mass index; bpm, beats per minute; CHD, coronary heart disease; MCS, mental health component score; SES, socioeconomic status; TIA, transient ischemic attack.