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Table 2 30-day prevalence of substance use

From: Multi-dimensional self-esteem and substance use among Chinese adolescents

   Cigarette use Alcohol use Drug use
  n (%) n (%) n (%)
Substance use 30-day prevalence by gender Male 64 (7.2)# 204 (22.8)# 14 (1.6)#
Female 20 (6.1)# 53 (16.1)# 2 (0.6)#
Total 84 (6.9)# 257 (21.0)# 16 (1.3)#
GSHS Questions Age at first substance use 7 9 (10.7) 44 (17.2) 6 (40.0)
8-9 11 (13.1) 42 (16.4) 4 (26.7)
10-11 10 (11.9) 54 (21.1) 0 (0.0)
12-13 33 (39.3) 67 (26.2) 2 (13.3)
14-15 14 (16.7) 38 (14.8) 1 (6.7)
16 7 (8.3) 11 (4.3) 2 (13.3)
Total 84 (100) 256 (100) 15 (100)
Substance use during last 30 days 1-2 days 29 (34.5) 127 (49.4) 6 (37.5)
3-5 days 9 (10.7) 45 (17.5) 7 (43.8)
6-9 days 5 (6.0) 18 (7.0) 1 (6.3)
10-19 days 14 (16.7) 17 (6.6) 0 (0.0)
20-29 days 8 (9.5) 13 (5.1) 0 (0.0)
30 days 19 (22.6) 37 (14.4) 2 (12.5)
   Total 84 (100) 257 (100) 16 (100)
  1. #The percentages are the 30 days prevalence.
  2. Only students with substance use were included.