. Author manuscript; available in PMC: 2014 Apr 1.

Published in final edited form as: J Sleep Res. 2012 Nov 9;22(2):201–208. doi: 10.1111/jsr.12003

Table 1.

Sample demographics (n=1113)

Exposure group	n	Mean (SD) age^*	% Male	% Managerial (n)
0y	387	75.5 (6.1y)	48.3	49.1
1 year=15 years	371	74.1 (6.5y)	52.0	38.5
>15 years	355	74.6 (6.4y)	71.6	29.3
Whole sample	1113	74.7 (6.3)	57.0	39.3

Sample size reduced by 5 (see text).

SD: standard deviation.