Table 2 Number and proportion of students with, and odds ratio for, depressive symptoms on CES-DC according to behavioral factors and school climate perception

 Females

432 (28.7)

1

1

1

 Males

119 (10.4)

0.3 (0.2,0.4)

0.3 (0.3,0.4)

0.3 (0.3,0.4)

 ≤ 8

80 (21.7)

1

1

1

 9–13

238 (20.1)

0.9 (0.7,1.2)

1.0 (0.8,1.4)

1.0 (0.7,1.4)

 ≥ 14

207 (20.5)

0.9 (0.7,1.2)

1.3 (0.9,1.7)

1.3 (0.9,1.7)

 Tobacco smoking

No

311 (17.0)

1

1

1

Yes

240 (29.1)

2.0 (1.6,2.4)

1.8 (1.5,2.3)

1.9 (1.5,2.3)

 Perceived tobacco dependence

No

399 (17.7)

1

1

1

Yes

126 (36.2)

2.6 (2.1,3.4)

2.2 (1.7,2.9)

2.3 (1.7,3.0)

 Alcohol consumption

No

299 (19.4)

1

1

1

Yes

244 (22.7)

1.2 (1.0,1.5)

1.4 (1.1,1.7)

1.4 (1.1,1.7)

 Perceived drunkenness

No

477 (20.0)

1

1

1

Yes

56 (29.2)

1.6 (1.2,2.3)

1.9 (1.3,2.7)

1.9 (1.3,2.8)

  0–3 h

382 (18.0)

1

1

1

  ≥ 4 h

157 (32.7)

2.2 (1.8,2.8)

1.9 (1.5,2.5)

1.9 (1.5,2.4)

  0–3 h

207 (14.4)

1

1

1

  4–5 h

145 (24.5)

1.9 (1.5,2.4)

1.5 (1.1,1.9)

1.4 (1.1,1.8)

  ≥ 6 h

188 (31.9)

2.8 (2.2,3.5)

1.9 (1.4,2.4)

1.8 (1.3,2.3)

  0–3 h

472 (19.8)

1

1

1

  ≥ 4 h

67 (32.4)

1.9 (1.4,2.6)

1.6 (1.1,2.2)

1.5 (1.1,2.1)

  0–3 h

490 (21.1)

1

1

1

  ≥ 4 h

48 (17.0)

0.8 (0.5,1.1)

1.3 (0.9,1.9)

1.2 (0.8,1.8)

  Victims

No

207 (13.5)

1

1

1

Yes

340 (30.6)

2.8 (2.3,3.4)

2.7 (2.2,3.4)

2.7 (2.2,3.4)

  Author

No

305 (19.3)

1

1

1

Yes

240 (22.7)

1.2 (1.0,1.5)

1.2 (1.0,1.5)

1.2 (1.0,1.5)

  Victims

No

476 (19.4)

1

1

1

Yes

64 (37.0)

2.4 (1.8,3.4)

3.2 (2.2,4.7)

3.3 (2.3,4.7)

  Author

No

471 (20.3)

1

1

1

Yes

63 (21.4)

1.1 (0.8,1.4)

1.3 (1.0,1.9)

1.4 (1.0,1.9)

  Victims

No

271 (15.9)

1

1

1

Yes

269 (29.0)

2.2 (1.8,2.6)

2.0 (1.6,2.4)

2.0 (1.6,2.5)

  Author

No

365 (19.5)

1

1

1

Yes

169 (22.5)

1.2 (1.0,1.5)

1.1 (0.9,1.3)

1.1 (0.9,1.4)

 Positive perception

293 (16.4)

1

1

1

 Negative perception

258 (29.7)

2.2 (1.8,2.6)

1.9 (1.6,2.4)

2.0 (1.6,2.5)