Table 2. Demographic characteristics of elementary students (N=167)
| Characteristics | 10 years old | 11 years old | 12 years old | Total |
| Boy (n=29) | Girl (n=32) | Total (n=61) | Boy (n=26) | Girl (n=33) | Total (n=59) | Boy (n=17) | Girl (n=30) | Total (n=47) | Boy (n=72) | Girl (n=95) | Total (N=167) |
| Dominant side |
| Right | 26(90.0) | 28(87.5) | 54(88.5) | 23(88.5) | 29(88.9) | 52(88.1) | 14(82.4) | 27(90.0) | 41(87.2) | 63(87.5) | 84(88.4) | 147(88.) |
| Left | 3(10.0) | 4(12.5) | 7(11.5) | 3(11.5) | 4(12.1) | 7(11.9) | 3(17.6) | 3(10.0) | 6(12.8) | 9(12.5) | 11(11.6) | 20(12.0) |
| Grade |
| 4 | 28(96.6) | 25(78.1) | 53(86.8) | 0(0.0) | 0(0.0) | 0(0.0) | 0(0.0) | 0(0.0) | 0(0.0) | 28(38.9) | 25(26.3) | 52(31.1) |
| 5 | 1(3.4) | 7(21.9) | 8(13.1) | 22(84.6) | 25(75.8) | 47(79.7) | 0(0.0) | 0(0.0) | 0(0.0) | 23(31.9) | 32(33.7) | 55(32.9) |
| 6 | 0(0.0) | 0(0.0) | 0(0.0) | 4(15.4) | 8(24.2) | 12(20.3) | 17(100.0) | 30(100.0) | 47(100.0) | 21(29.2) | 38(40.0) | 59(35.3) |
| Height |
| <SV | 7(24.1) | 11(34.4) | - | 5(19.2) | 5(15.2) | - | 4(23.5) | 7(23.3) | - | - | - | - |
| >SV | 12(41.4) | 8(25.0) | 13(50.0) | 20(60.6) | 5(29.4) | 13(43.3) |
| Weight |
| <SV | 10(34.5) | 12(37.5) | - | 6(23.1) | 5(15.2) | | 2(11.8) | 9(30.0) | - | - | - | - |
| >SV | 18(62.1) | 16(50.0) | 11(42.3) | 20(60.6) | 12(70.6) | 15(50.0) |
Data is expressed as frequency(percent).
SV, gender- and age-related standard value from standard.