Table 2.
Descriptive Statistics for Infant Socio-emotional Behaviors and Adoptive-Birth Group Differences
| Adoptive | Birth | |||||||
|---|---|---|---|---|---|---|---|---|
| Behaviors | M | SD | M | SD | F | df | p≤ | η2p |
| Alert expression: Mean z score | 3.88 | 1.04 | 4.50 | 1.16 | 7.42 | 72 | .01 | .09 |
| Frequency: Rate per hour | 102.02 | 43.16 | 135.37 | 34.54 | ||||
| Duration: Proportion of hour | .75 | .11 | .73 | .09 | ||||
| Look at mother: Mean z score | 4.43 | 1.90 | 4.33 | 1.91 | .05 | 72 | ns | .00 |
| Frequency: Rate per hour | 71.17 | 30.38 | 66.19 | 30.15 | ||||
| Duration: Proportion of hour | .08 | .05 | .08 | .05 | ||||
| Smile: Mean z score | 2.12 | 2.17 | 2.90 | 1.71 | 7.80 | 72 | .01 | .10 |
| Frequency: Rate per hour | 10.64 | 19.69 | 17.32 | 14.46 | ||||
| Duration: Proportion of hour | .006 | .01 | .01 | .01 | ||||
| Non-distress vocalization: Mean z score | 3.89 | 1.92 | 4.19 | 1.73 | .95 | 72 | ns | .01 |
| Frequency: Rate per hour | 140.41 | 74.74 | 150.13 | 73.54 | ||||
| Duration: Proportion of hour | .08 | .06 | .09 | .06 | ||||
| Negative facial expression: Mean z score | 2.48 | 2.20 | 2.82 | 1.55 | 2.43 | 72 | ns | .03 |
| Frequency: Rate per hour | 6.45 | 8.38 | 9.05 | 6.93 | ||||
| Duration: Proportion of hour | .01 | .02 | .01 | .01 | ||||
| Distress vocalization: Mean z score | 2.53 | 2.03 | 2.51 | 1.87 | .00 | 72 | ns | .00 |
| Frequency: Rate per hour | 10.74 | 12.61 | 10.02 | 12.64 | ||||
| Duration: Proportion of hour | .01 | .02 | .02 | .02 | ||||