Table 1. Descriptive Statistics for Self-regulation by Sample and Age.
| Variable | Michigan longitudinal | MLSELD preschool | Oregon | ||||||
|---|---|---|---|---|---|---|---|---|---|
|
| |||||||||
| Self-regulation | N | M | SD | N | M | SD | N | M | SD |
| -HTKS age 39 mos. or less | - | - | - | 103 | 3.66 | 7.70 | - | - | - |
| -HTKS age 40 – 42 mos. | 98 | 4.98 | 8.92 | 128 | 5.50 | 9.95 | - | - | - |
| -HTKS age 43 – 45 mos. | 101 | 8.92 | 12.26 | 144 | 7.25 | 11.38 | - | - | - |
| -HTKS age 46 – 48 mos. | 111 | 12.95 | 14.81 | 185 | 9.15 | 11.32 | - | - | - |
| -HTKS age 49 – 51 mos. | 111 | 18.21 | 15.16 | 241 | 11.95 | 13.49 | - | - | - |
| -HTKS age 52 – 54 mos. | 153 | 20.48 | 15.22 | 276 | 16.73 | 14.27 | 157 | 12.44 | 13.11 |
| -HTKS age 55 – 57 mos. | 151 | 21.67 | 14.58 | 293 | 17.63 | 14.86 | 161 | 16.53 | 13.32 |
| -HTKS age 58 – 60 mos. | 152 | 25.19 | 13.46 | 217 | 22.78 | 14.28 | 201 | 18.74 | 14.20 |
| -HTKS age 61 – 63 mos. | 128 | 28.29 | 10.61 | 165 | 25.28 | 14.01 | 186 | 21.78 | 14.40 |
| -HTKS age 64 – 66 mos. | 140 | 29.51 | 10.78 | - | - | - | 174 | 23.15 | 13.54 |
| -HTKS age 67 – 69 mos. | 154 | 31.20 | 8.90 | - | - | - | 140 | 26.61 | 13.01 |
| -HTKS age 70 – 72 mos. | 110 | 33.49 | 6.97 | - | - | - | 162 | 28.85 | 10.47 |
| -HTKS age 73 – 75 mos. | 108 | 35.58 | 4.85 | - | - | - | 97 | 30.32 | 11.84 |
| -HTKS age 76 – 78 mos. | 118 | 35.37 | 5.31 | - | - | - | 95 | 30.47 | 10.61 |
| -HTKS age 79 – 81 mos. | 113 | 37.05 | 3.08 | - | - | - | - | - | - |
| -HTKS age 82 – 84 mos. | 80 | 36.60 | 4.56 | - | - | - | - | - | - |
| -HTKS age 85 mos. or more | 61 | 37.55 | 3.30 | - | - | - | - | - | - |
Note. HTKS refers to the Head-Toes-Knees-Shoulders task. Mos. refers to months. Dashes represent ages that data were not collected by sample.