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Table 1 General characteristics of suicidal behaviors in the study population

From: Interaction of smoking and being bullied on suicidal behaviors: a school-based cross-sectional survey in China

Variable Total sample
(n = 18,900)
Suicidal ideation (n = 4982) Suicidal plan (n = 2493) Suicidal attempt (n = 983)
n (%) χ2 P n (%) χ2 P n (%) χ2 P
Gender    78.90  < 0.001   8.64 0.003   0.46 0.496
 Male 8986 (47.5) 2100 (23.4)    1117 (12.4)    457 (5.1)   
 Female 9914 (52.5) 2882 (29.1)    1376 (13.9)    526 (5.3)   
Residential background    36.15  < 0.001   28.90  < 0.001   1.23 0.267
 Rural 9401 (49.7) 2296 (24.4)    1115 (11.9)    472 (5.0)   
 Urban 9499 (50.3) 2686 (28.3)    1378 (14.5)    511 (5.4)   
Any siblings    0.29 0.589   0.06 0.805   2.99 0.084
 Yes 10,081 (53.3) 2641 (26.2)    1324 (13.1)    498 (4.9)   
 No 8819 (46.7) 2341 (26.5)    116 (13.3)    485 (5.5)   
Grade    20.58  < 0.001   3.45 0.063   9.65 0.002
 Junior high school 10,386 (55.0) 2601 (25.0)    1327 (12.8)    493 (4.7)   
 Senior high school 8514 (45.0) 2381 (28.0)    1166 (13.7)    490 (5.8)   
Accommodation type    15.04  < 0.001   8.35 0.004   1.32 0.251
 Boarding student 9566 (50.6) 2639 (27.6)    1329 (13.9)    480 (5.0)   
 Commuting student 9334 (49.4) 2343 (25.1)    1164 (12.5)    503 (5.4)   
Father’s educational level    45.89  < 0.001   61.04  < 0.001   106.31  < 0.001
  < High school degree 10,545 (55.8) 2701 (25.6)    1304 (12.4)    477 (4.5)   
  ≥ High school degree 8136 (43.0) 2181 (26.8)    1124 (13.8)    463 (5.7)   
 No father 219 (1.2) 100 (45.7)    65 (29.7)    43 (19.6)   
Mother’s educational level    19.57  < 0.001   36.60  < 0.001   78.51  < 0.001
  < High school degree 11,490 (60.8) 2948 (25.7)    1414 (12.3)    564 (4.9)   
  ≥ High school degree 7217 (38.2) 1960 (27.2)    1032 (14.3)    382 (5.3)   
 No mother 193 (1) 74 (38.3)    47 (24.4)    37 (19.2)   
Self-reported family economy    181.91  < 0.001   130.75  < 0.001   100.89  < 0.001
 Bad 2695 (14.2) 994 (36.9)    535 (19.9)    234 (8.7)   
 General 13,374 (70.8) 3257 (24.4)    1567 (11.7)    566 (4.2)   
 Good 2831 (15.0) 731 (25.8)    391 (13.8)    183 (6.5)   
Number of friends    227.01  < 0.001   105.97  < 0.001   32.71  < 0.001
  ≤ 2 4630 (24.5) 1584 (34.2)    809 (17.5)    314 (6.8)   
 3–5 7719 (40.8) 1987 (25.7)    967 (12.5)    345 (4.5)   
  ≥ 6 6551 (34.7) 1411 (21.5)    717 (10.9)    324 (4.9)   
Smoking    230.30  < 0.001   401.46  < 0.001   866.89  < 0.001
 Yes 579 (3.1) 311 (53.7)    237 (40.9)    185 (32.0)   
 No 18,321 (96.9) 4671 (25.5)    2256 (12.3)    798 (4.4)   
Being bullied    709.48  < 0.001   569.18  < 0.001   343.09  < 0.001
 Yes 3891 (20.6) 1678 (43.1)    962 (24.7)    431 (11.1)   
 No 15,009 (79.4) 3304 (22.0)    1531 (10.2)    552 (3.7)   
  1. Statistical methods: Chi-square test