Data shown are the mean (M) and standard deviation (SD) for the percentage of children using (Use) each feature to try a trick, the percentage of tricks that ended in a fall (Fall) and feature Risk (Use × Fall) as a function of age group (n=171 for young skateboarders 11–15 years, n=369 for older skateboarders 16–20 years)
| Feature | Young | Old | ||||
| Use M (SD) | Fall M (SD) | Risk M (SD) | Use M (SD) | Fall M (SD) | Risk M (SD) | |
| Flat ground | 74 (44) | 65 (36) | 48 (42) | 71 (45) | 61 (37) | 44 (42) |
| 95% CI | (67, 80) | (59, 71) | (41, 54) | (67, 76) | (56, 65) | (39, 48) |
| Grind box | 14 (35) | 85 (25) | 12 (31) | 35 (48) | 67 (36) | 23 (38) |
| 95% CI | (09, 19) | (75, 96) | (07, 17) | (30, 40) | (60, 73) | (20, 27) |
| Quarter pipe | 46 (50) | 34 (35) | 16 (29) | 46 (50) | 35 (37) | 16 (31) |
| 95% CI | (39, 54) | (26, 41) | (12, 21) | (41, 51) | (29, 40) | (13, 19) |
| Railing | 1 (8) | 1 (0) | 1 (8) | 9 (28) | 79 (34) | 7 (24) |
| 95% CI | (00, 02) | NA | (00, 02) | (06, 12) | (67, 92) | (04, 09) |
| Ramp | 47 (50) | 36 (42) | 17 (34) | 51 (50) | 41 (39) | 21 (34) |
| 95% CI | (39, 55) | (27, 45) | (12, 22) | (46, 56) | (35, 46) | (17, 24) |
| Stairs | 1 (11) | 50 (71) | 1 (8) | 4 (18) | 44 (45) | 2 (11) |
| 95% CI | (00, 03) | (00, 685) | (00, 02) | (17, 71) | (17, 71) | (00, 03) |
95% CIs for means; scores were truncated to 0 for % scores.