Table 1 Subject characteristics
|  | Overall (n = 67) | Users (n = 52) | Non-Users (n = 15) | p-value |
|---|---|---|---|---|
Parent gender, n(%) |  |  |  | – |
 Female | 67 (100%) | 52 (100%) | 15 (100%) |  |
 Male | 0 (0%) | 0 (0%) | 0 (0%) |  |
Parent age, mean(SD) | 43.13 (5.22) | 43.46 (5.04) | 42.00 (5.84) | 0.343 |
Parent education level, n(%) | Â | Â | Â | 0.059 |
 Primary education or below | 4 (6.00) | 3 (5.90) | 1 (7.70) |  |
 Secondary education | 25 (37.30) | 18 (35.30) | 7 (53.80) |  |
 Post-secondary education | 6 (9.00) | 3 (5.90) | 3 (23.10) |  |
 Tertiary education | 29 (43.30) | 27 (52.90) | 2 (15.40) |  |
 Missing | 3 (4.50) | – | – |  |
Parent employment, n(%) | Â | Â | Â | 0.002 |
 Employed | 35 (52.20) | 33 (64.70) | 2 (15.40) |  |
 Unemployed | 29 (43.30) | 18 (35.30) | 11 (84.60) |  |
 Missing | 3 (4.50) | – | – |  |
Child gender, n(%) | Â | Â | Â | 0.146 |
 Female | 13 (19.40) | 8 (15.38) | 5 (33.33) |  |
 Male | 54 (80.60) | 44 (84.62) | 10 (66.67) |  |
Child age, mean(SD) | 10.52(2.10) | 10.38(2.20) | 11.00(1.69) | 0.321 |
Monthly household income (HKD ‘000), mean(SD) | 73.05(88.56) | 74.02 (73.81) | 69.11(137.80) | 0.865 |