Table 3. Stigma and the smoking environment at school among adolescents in seven European cities: Multilevel linear regression stratified by smoking status, SILNE R study 2016.

	Stigmatization (mean score = 1.43 std = 0.38)
	Model 2 (non-smokers)	Model 2 (occasional)	Model 2 (weekly)
	β (StdErr)	β (StdErr)	β (StdErr)
Mean STP score per school (0–10)	0.004 (0.006)	0.002 (0.010)	0.010 (0.013)
% of weekly smokers in the school	0.001 (0.001)	0.005* (0.001)	-0.005* (0.002)
Weekly smoking among peers (%)	-0.082* (0.026)	-0.128** (0.032)	0.021 (0.037)
Academic performance (ref = high)
Average	-0.021* (0.008)	-0.027 (0.019)	0.002 (0.030)
Low	-0.049** (0.011)	-0.031 (0.022)	0.015 (0.034)
Parents’ education (ref = high)
Medium	0.034** (0.010)	0.035 (0.024)	0.076* (0.037)
Low	0.005 (0.011)	0.012 (0.024)	0.061 (0.036)
Unknown	0.028 (0.038)	-0.069 (0.093)	0.027 (0.133)
School variance component	0.007* (0.000)	0.012 (0.001)	0.000** (0.007)

For linear regression, we determined an average stigma score by summing all scores for the four Likert items and dividing by four.

For the stratification, we included only occasional and weekly smokers in these analyses.

* P-value < 0.05;

**P-value < 0.001