Table 3 Ordinary least‐squares regression on the annual number of days of sickness among Swedish adults for the period 1988–91.

	Full sample	Males	Females
Controlling for occupational factors
Current smoker	9.67 (7.18 to 12.15)	9.67 (6.35 to 12.98)	9.50 (6.03 to 12.96)
Former smoker	2.52 (0.14 to 4.90)	2.83 (−0.42 to 6.08)	2.35 (−1.40 to 6.10)
Never smoker (reference category)	na	na	na
Observations	14 272	7020	7252
Controlling for health factors
Current smoker	7.67 (5.43 to 9.90)	7.26 (4.22 to 10.31)	7.55 (4.30 to 10.81)
Former smoker	0.58 (−1.60 to 2.76)	−0.19 (−3.01 to 2.63)	1.05 (−2.27 to 4.37)
Never smoker (reference category)
Observations	14 272	7020	7252

na, not applicable.