Table 1 Comparison of student and school-level characteristics between samples
| Â | Â | School consented to data linkage question | Â | |
|---|---|---|---|---|
|  | Full SHW survey sample (n = 103,971; schools = 193) | Data linkage sub-sample (n = 18,956; schools = 39) | Data linkage control sample (n = 8374; schools = 22)a | Regression-based P-value (data linkage vs. non-data linkage sample)b |
| Â | n (%) | n (%) | n (%) | Â |
Student-level | ||||
 Gender | ||||
  Male | 50,452 (48.5) | 9545 (50.4) | 3788 (45.2) | 0.078 |
  Female | 51,458 (49.5) | 9064 (47.8) | 4421 (52.8) | 0.110 |
  Did not want to answer | 2061 (2.0) | 347 (1.8) | 165 (2.0) | 0.283 |
 School grade | ||||
  Year 7 | 22,634 (21.8) | 3787 (20.0) | 2064 (24.7) | 0.005 |
  Year 8 | 22,421 (21.6) | 4122 (21.8) | 1998 (23.9) | 0.755 |
  Year 9 | 22,208 (21.4) | 4347 (22.9) | 1628 (19.4) | 0.023 |
  Year 10 | 19,704 (19.0) | 3500 (18.5) | 1417 (16.9) | 0.580 |
  Year 11 | 17,004 (16.4) | 3200 (16.9) | 1267 (15.1) | 0.552 |
 Weekly cigarette smoker | ||||
  No | 96,170 (96.6) | 17,656 (96.9) | 7745 (96.4) | – |
  Yes | 3422 (3.4) | 571 (3.1) | 291 (3.6) | 0.168 |
 cannabis use | ||||
  No | 94,156 (95.6) | 17,799 (96.2) | 7604 (95.5) | – |
  Yes | 4305 (4.4) | 699 (3.8) | 357 (4.5) | 0.061 |
 Ever truant | ||||
  No | 68,071 (73.9) | 13,666 (75.4) | 5457 (73.2) | – |
  Yes | 23,989 (26.1) | 4455 (24.6) | 1995 (26.8) | 0.046 |
 Ever excluded | ||||
  No | 86,614 (92.2) | 17,216 (93.0) | 6947 (91.1) | – |
  Yes | 7370 (7.8) | 1304 (7.0) | 675 (8.9) | 0.091 |
SWEMWBS (sd.) | 21.955 (4.51) | 22.094 (4.33) | 21.867 (4.40) | 0.048 |
FAS (sd.) | 9.28 (2.34) | 9.333 (2.32) | 9.166 (2.34) | 0.557 |
School-level | ||||
 Mean FAS (sd.) | 9.309 (0.63) | 9.353 (0.50) | 9.192 (0.653) | 0.595 |