Table 3.
Measures Assessing Potential Covariates Regarding Mothers’ Corresponding Behaviors With Their Infants, Maternal Verbal Intelligence, Education, and Parenting Knowledge
| Measure | M | SD |
|---|---|---|
| Promotion of motor development | 0.12 | 0.09 |
| Encouragement of balance | 0.20 | 0.16 |
| Encouragement of movement | 0.03 | 0.05 |
| Promotion of exploration (Z aggregate score) | 0.00 | 0.91 |
| Duration (min) | 5.01 | 4.00 |
| Frequency | 30.64 | 19.23 |
| Material support (Z aggregate score) | 0.00 | 0.60 |
| Quantity of objects provided | ||
| Variety | 10.47 | 5.53 |
| Density | 2.66 | 1.44 |
| Consistency | 7.95 | 1.87 |
| Quality of objects provided | ||
| Responsiveness | 9.10 | 1.44 |
| Number of highly responsive objects | 1.21 | 1.21 |
| Proportion of highly responsive objects | 0.13 | 0.15 |
| Maternal verbal intelligence: Peabody Picture Vocabulary Test-Revised (Dunn & Dunn, 1981)a | 108.19 | 16.95 |
| Maternal educationb | 5.47 | 1.43 |
| Parenting knowledge: Knowledge of Infant Development Inventory (MacPhee, 1981)c | 0.80 | 0.08 |
a
The mean standard score for this measure is 100 (SD = 15).
b
Total possible scores for this measure range from 1 to 7.
c
Possible scores for this measure range from 0 to 1.