Table 2.

Risk of absenteeism, by cause (odds ratios, 95% CI)^a

	Illness			Skip			Any
	Model 1	Model 2	Model 3	Model 1	Model 2	Model 3	Model 1	Model 2	Model 3
Smoking intensity
Less than one cigarette per day per month	1.30 (1.23; 1.37)	1.27 (1.20; 1.34)	1.23 (1.16; 1.30)	1.63 (1.54; 1.73)	1.47 (1.39; 1.56)	1.32 (1.25; 1.41)	1.48 (1.41; 1.54)	1.38 (1.32; 1.45)	1.28 (1.22; 1.35)
One to five cigarettes per day	1.48 (1.39; 1.58)	1.42 (1.34; 1.51)	1.35 (1.27; 1.44)	2.13 (2.00; 2.28)	1.84 (1.73; 1.97)	1.56 (1.46; 1.67)	1.87 (1.77; 1.98)	1.70 (1.61; 1.80)	1.51 (1.42; 1.60)
More than five cigarettes per day	1.80 (1.71; 1.90)	1.67 (1.58; 1.77)	1.55 (1.46; 1.64)	3.68 (3.50; 3.88)	2.97 (2.81; 3.14)	2.29 (2.16; 2.43)	2.85 (2.72; 2.99)	2.46 (2.34; 2.58)	2.03 (1.93; 2.14)
Female	1.21 (1.17; 1.25)	1.22 (1.18; 1.26)	1.23 (1.19; 1.28)	0.93 (0.89; 0.96)	0.97 (0.94; 1.01)	1.01 (0.97; 1.05)	1.08 (1.05; 1.11)	1.12 (1.08; 1.15)	1.14 (1.11; 1.18)
Age
15	Ref	Ref	Ref	Ref	Ref	Ref	Ref	Ref	Ref
16	1.12 (0.87; 1.44)	1.12 (0.87; 1.44)	1.13 (0.87; 1.45)	1.20 (0.90; 1.59)	1.22 (0.91; 1.62)	1.24 (0.93; 1.65)	1.17 (0.95; 1.44)	1.18 (0.96; 1.45)	1.19 (0.97; 1.47)
Parental education
Primary school or less		Ref	Ref		Ref	Ref		Ref	Ref
Some secondary school		0.82 (0.73; 0.91)	0.81 (0.73; 0.90)		0.89 (0.79; 1.00)	0.89 (0.79; 1.00)		0.87 (0.79; 0.95)	0.86 (0.78; 0.95)
Completed secondary school		0.78 (0.71; 0.86)	0.78 (0.71; 0.86)		0.85 (0.76; 0.95)	0.85 (0.76; 0.95)		0.84 (0.77; 0.91)	0.84 (0.77; 0.91)
Some college or university		0.79 (0.71; 0.87)	0.78 (0.70; 0.87)		0.92 (0.82; 1.04)	0.92 (0.82; 1.04)		0.89 (0.81; 0.98)	0.89 (0.81; 0.97)
Completed college or university		0.72 (0.65; 0.80)	0.72 (0.65; 0.79)		0.90 (0.81; 1.01)	0.90 (0.81; 1.01)		0.83 (0.76; 0.90)	0.82 (0.75; 0.90)
Subjective social status
Very much/much better off		Ref	Ref		Ref	Ref		Ref	Ref
Better off		0.87 (0.83; 0.92)	0.87 (0.83; 0.92)		0.92 (0.87; 0.97)	0.92 (0.87; 0.97)		0.88 (0.84; 0.92)	0.88 (0.84; 0.93)
About the same		0.85 (0.81; 0.89)	0.85 (0.81; 0.89)		0.86 (0.81; 0.91)	0.88 (0.83; 0.92)		0.84 (0.81; 0.88)	0.85 (0.82; 0.89)
Less well off		0.94 (0.88; 1.01)	0.95 (0.88; 1.02)		0.97 (0.90; 1.05)	0.97 (0.91; 1.07)		0.94 (0.88: 1.00)	0.95 (0.89: 1.01)
Much/very much less well off		1.12 (1.00; 1.24)	1.12 (1.01; 1.24)		1.07 (0.94; 1.21)	1.07 (0.95; 1.21)		1.11 (1.01; 1.22)	1.12 (1.01; 1.23)
Low performance		1.30 (1.24; 1.36)	1.28 (1.22; 1.35)		2.00 (1.91; 2.10)	1.92 (1.83; 2.02)		1.69 (1.62; 1.76)	1.64 (1.57; 1.71)
Parental support		1.05 (1.00; 1.09)	1.05 (1.01; 1.10)		0.88 (0.84; 0.92)	0.89 (0.85; 0.94)		0.97 (0.94; 1.01)	0.98 (0.95; 1.02)
Parental control		0.93 (0.89; 0.97)	0.95 (0.91; 1.00)		0.69 (0.66; 0.72)	0.73 (0.70; 0.77)		0.78 (0.75; 0.81)	0.82 (0.79; 0.85)
Weekly alcohol			1.14 (1.03; 1.26)			1.27 (1.15; 1.41)			1.25 (1.15; 1.37)
Binge drinking			1.24 (1.18; 1.30)			1.64 (1.56; 1.73)			1.48 (1.41; 1.54)
Regular cannabis			1.00 (0.93; 1.07)			1.39 (1.30; 1.49)			1.24 (1.17; 1.32)
n	92 463	92 463	92 463	92 463	92 463	92 463	92 463	92 463	92 463

^aAll regressions included country fixed effects, which are not presented to ease the reading.