Table 2 The prevalence and mean score of tooth wear according to gender
From: The prevalence and risk indicators of tooth wear in 12- and 15-year-old adolescents in Central China
|  | N | Prevalence of TW | Prevalence of DE | Mean score of BEWE (±SD) |
|---|---|---|---|---|
N (%) | N (%) | |||
12Â years | ||||
 Boy | 180 | 35 (19.4) | 7 (3.9) |  |
 Girl | 180 | 32 (17.8) | 0 (0) |  |
 Total | 360 | 67 (18.6) | 7 (1.9) | 1.19 (±0.41) |
15Â years | ||||
 Boy | 180 | 166 (92.2) | 10 (5.6) |  |
 Girl | 180 | 156 (86.7) | 10 (5.6) |  |
 Total | 360 | 322 (89.4) | 20 (5.6) | 1.97 (±0.44) |