Baseline characteristics of participating schools and students
| Randomisation sequence | School characteristics | Student characteristics | |||||||||
| School | School roll, n | Location | Decile | N (%) | Sex, n (%) | Ethnicity, n (%) | Age, mean ± SD | ||||
| Female | Male | Māori | Pacific | NZEO | Years | ||||||
| 1 | A | 208 | Hamilton | 3 | 25 (6) | 12 (48) | 13 (52) | 14 (56) | 1 (4) | 10 (40) | 7.7±1.7 |
| B | 200 | Auckland | 1 | 25 (6) | 8 (32) | 17 (68) | 14 (56) | 9 (36) | 2 (8) | 7.8±1.7 | |
| C | 425 | Auckland | 3 | 38 (9) | 16 (42) | 22 (58) | 8 (21) | 17 (45) | 13 (34) | 7.5±1.6 | |
| D | 529 | Auckland | 4 | 58 (14) | 43 (74) | 15 (26) | 6 (10) | 44 (76) | 8 (14) | 11.2±0.6 | |
| 2 | E | 118 | Wellington | 2 | 24 (6) | 13 (54) | 11 (46) | 12 (50) | 3 (13) | 9 (38) | 7.7±1.5 |
| F | 332 | Auckland | 3 | 35 (8) | 22 (63) | 13 (37) | 8 (23) | 15 (43) | 12 (34) | 11.3±0.8 | |
| G | 137 | Wellington | 1 | 49 (12) | 25 (51) | 24 (49) | 9 (18) | 34 (69) | 6 (12) | 9.4±2.1 | |
| 3 | H | 516 | Auckland | 3 | 17 (4) | 10 (59) | 7 (41) | 9 (53) | 3 (18) | 5 (29) | 11.2±0.7 |
| I | 234 | Auckland | 2 | 27 (6) | 14 (52) | 13 (48) | 7 (26) | 19 (70) | 1 (4) | 8.1±1.4 | |
| J | 173 | Wellington | 2 | 25 (6) | 11 (44) | 14 (56) | 16 (64) | 6 (24) | 3 (12) | 8.3±2.0 | |
| 4 | K | 263 | Hamilton | 2 | 19 (5) | 9 (47) | 10 (53) | 10 (53) | 0 (0) | 9 (47) | 9.4±0.5 |
| L | 324 | Auckland | 3 | 33 (8) | 11 (33) | 22 (67) | 7 (21) | 12 (36) | 14 (42) | 11.4±0.7 | |
| M | 373 | Auckland | 2 | 39 (9) | 23 (59) | 16 (41) | 21 (54) | 13 (33) | 4 (10) | 8.8±1.2 | |
| N | 420 | Auckland | 4 | 10 (2) | 7 (70) | 3 (30) | 5 (50) | 3 (30) | 2 (20) | 8.6±1.4 | |
| Total | 14 schools | 4252 | 424 (100) | 224 (53) | 200 (47) | 146 (34) | 179 (42) | 98 (23) | 9.4±2.0 | ||
NWEO, New Zealand European or Other.