Table I.
Descriptive Statistics for Problem Behaviors by Rater and Sex of Child
| Year | Age in Years (SD) | Mean Internalizing (SD) | Mean Externalizing (SD) | Full n |
|---|---|---|---|---|
| Teacher Ratings | ||||
| Female children | ||||
| Year 7 | 7.39 (0.36) | 5.27 (5.76) | 3.91 (7.11) | 289 |
| Year 8 | 8.38 (0.34) | 4.33 (4.78) | 3.31 (5.66) | 270 |
| Year 9 | 9.40 (0.38) | 4.87 (5.53) | 3.97 (7.35) | 261 |
| Year10 | 9.93 (0.38) | 4.82 (5.77) | 3.20 (5.56) | 253 |
| Year 11 | 11.38 (0.38) | 4.04 (4.58) | 2.88 (5.67) | 249 |
| Year 12 | 12.40 (0.37) | 4.32 (5.11) | 2.43 (4.43) | 234 |
| Year 13 | 12.87 (0.44) | 4.48 (5.34) | 2.27 (5.36) | 203 |
| Year 14 | 13.90 (0.40) | 4.12 (4.37) | 2.32 (4.37) | 188 |
| Year 15a | 14.81 (0.40) | 3.52 (5.24) | 2.37 (4.94) | 136 |
| Male children | ||||
| Year 7 | 7.50 (0.39) | 5.42 (5.89) | 7.03 (9.50) | 285 |
| Year 8 | 8.47 (0.37) | 6.00 (6.42) | 7.18 (9.03) | 263 |
| Year 9 | 9.49 (0.39) | 5.47 (6.19) | 6.51 (8.58) | 248 |
| Year10 | 9.99 (0.41) | 5.53 (5.70) | 6.00 (8.21) | 258 |
| Year 11 | 11.41 (0.36) | 5.17 (6.28) | 6.32 (8.52) | 252 |
| Year 12 | 12.47 (0.38) | 4.19 (5.49) | 5.23 (8.39) | 204 |
| Year 13 | 12.98 (0.45) | 4.70 (5.72) | 5.06 (8.15) | 172 |
| Year 14 | 13.97 (0.43) | 4.36 (5.79) | 5.76 (8.57) | 167 |
| Year 15a | 14.90 (0.35) | 3.93 (5.02) | 3.36 (5.40) | 120 |
| Parent Ratings | ||||
| Female children | ||||
| Year 7 | 7.43 (0.36) | 4.90 (4.50) | 6.63 (5.72) | 319 |
| Year 9 | 9.40 (0.38) | 5.13 (5.19) | 6.43 (6.24) | 327 |
| Year10 | 9.93 (0.38) | 4.92 (4.85) | 5.78 (5.77) | 299 |
| Year 11 | 11.38 (0.38) | 4.39 (4.96) | 4.65 (5.13) | 234 |
| Year 12 | 12.40 (0.37) | 5.71 (6.12) | 5.94 (6.60) | 340 |
| Year 13 | 12.87 (0.44) | 4.90 (5.51) | 5.23 (6.16) | 273 |
| Year 14 | 13.90 (0.40) | 5.34 (6.03) | 5.10 (6.86) | 260 |
| Year 15a | 14.81 (0.40) | 4.34 (5.41) | 3.80 (4.83) | 186 |
| Year 16 | 16.59 (0.83) | 6.10 (6.51) | 5.46 (6.82) | 322 |
| Male children | ||||
| Year 7 | 7.43 (0.36) | 4.64 (4.61) | 8.75 (7.08) | 308 |
| Year 9 | 9.49 (0.39) | 4.92 (5.11) | 8.25 (7.07) | 311 |
| Year10 | 9.99 (0.41) | 4.85 (4.96) | 7.47 (6.81) | 279 |
| Year 11 | 11.41 (0.36) | 4.92 (5.32) | 7.81 (7.41) | 258 |
| Year 12 | 12.47 (0.38) | 5.09 (4.86) | 7.59 (6.88) | 312 |
| Year 13 | 12.98 (0.45) | 4.85 (5.49) | 7.27 (7.39) | 233 |
| Year 14 | 13.97 (0.43) | 4.52 (4.85) | 6.90 (6.90) | 223 |
| Year 15a | 14.90 (0.35) | 3.89 (5.24) | 5.84 (7.02) | 165 |
| Year 16 | 16.57 (0.75) | 4.99 (5.68) | 7.56 (8.56) | 313 |
Note. Reproduced with permission from Hatoum et al. (in press).
a
For twins whose 16th birthdays were within 4 months of when the age 15 assessment would have been completed, the age 15 assessment was skipped, resulting in a smaller n for that year.