All year groups (11–16 years) | Year 11 (15–16 years) only | |||
---|---|---|---|---|
% (n) | RRR (95% CI) | % (n) | RRR (95% CI) | |
Sex | ||||
Male | 19.3 (2795) | 0.88 (0.82 to 0.96) | 37.6 (866) | 0.96 (0.82 to 1.12) |
Female | 17.7 (2792) | 1.00 | 37.2 (994) | 1.00 |
Ethnicity | ||||
White | 18.6 (4896) | 1.00 | 37.6 (1635) | 1.00 |
BME | 19.1 (602) | 1.03 (0.82 to 1.31) | 35.4 (203) | 0.91 (0.61 to 1.35) |
FAS | – | 0.96 (0.94 to 0.98) | – | 0.95 (0.93 to 0.98) |
Ever smoked | ||||
No | 10.4 (2789) | 1.00 | 19.9 (722) | 1.00 |
Yes | 85.9 (2712) | 52.96 (44.31 to 63.29) | 85.0 (1122) | 23.08 (17.48 to 30.48) |
Smoking status | ||||
I do not smoke | 13.6 (3835) | 1.00 | 27.7 (1149) | 1.00 |
Less than once a week | 84.6 (366) | 34.80 (24.87 to 48.70) | 82.1 (156) | 12.09 (7.23 to 20.23) |
At least once a week (but not every day) | 90.8 (286) | 65.07 (39.03 to 108.47) | 89.0 (109) | 22.10 (11.85 to 41.19) |
Every day | 92.4 (607) | 74.36 (53.76 to 102.86) | 92.6 (280) | 32.08 (19.22 to 53.55) |
Ex-smoker | 85.4 (298) | 37.97 (27.34 to 52.74) | 85.0 (111) | 14.62 (8.98 to 23.82) |
Ever used cannabis | ||||
No | 14.1 (3496) | 1.00 | 27.3 (998) | 1.00 |
Yes | 86.8 (1121) | 39.60 (30.92 to 50.71) | 87.2 (561) | 18.24 (13.56 to 24.55) |
Cannabis use | ||||
None | 15.7 (3995) | 1.00 | 31.7 (1263) | 1.00 |
Less than daily | 90.7 (467) | 50.47 (34.71 to 73.38) | 92.3 (225) | 25.78 (14.87 to 44.71) |
Every day | 86.7 (184) | 33.14 (21.92 to 50.10) | 89.7 (85) | 18.51 (9.89 to 34.62) |
Ever used mephedrone | ||||
No | 17.3 (4450) | 1.00 | 35.8 (1511) | 1.00 |
Yes | 73.8 (233) | 13.02 (9.20 to 18.42) | 83.0 (93) | 8.89 (5.48 to 14.43) |
Ever used laughing gas | ||||
No | 13.0 (2479) | 1.00 | 30.8 (972) | 1.00 |
Yes | 31.9 (2255) | 3.18 (2.92 to 3.46) | 53.2 (634) | 2.58 (2.21 to 3.01) |
Alcohol | ||||
None | 7.2 (1551) | 1.00 | 14.4 (279) | 1.00 |
1–5 | 37.2 (2349) | 7.63 (6.93 to 8.41) | 40.5 (764) | 4.04 (3.44 to 4.75) |
5+ | 72.0 (1326) | 33.51 (28.96 to 38.77) | 71.5 (713) | 15.08 (11.96 to 19.03) |
Bold values signify significant findings p<0.05.
BME, black and minority ethnicity; FAS, Family Affluence Scale; RRR, relative risk ratio.