TABLE 1.
Means and SDs of IBQ-R factor and subscale scores for 4- and 12-month-old infants in the Netherlands and USA
| The USA |
Netherlands |
||||
|---|---|---|---|---|---|
| 4 Months | 12 Months | 4 Months | 12 Months | ||
| Scale | M (SD) | M (SD) | M (SD) | M (SD) | |
| Surgency | 4.11 (.78) | 5.05 (.50) | 3.89 (.70) | 4.55 (.50) | |
| Approach | 3.87 (1.38) | 5.42 (.64) | 3.75 (1.14) | 4.97 (.69) | |
| Vocal Reactivity | 4.32 (1.06) | 5.24 (.64) | 3.95 (.93) | 4.46 (.94) | |
| High-Intensity Pleasure | 5.17 (.94) | 5.88 (.59) | 4.92 (.87) | 5.66 (.58) | |
| Smiling and Laughter | 4.52 (1.09) | 4.84 (.72) | 4.57 (1.00) | 4.67 (.79) | |
| Activity Level | 3.81 (.85) | 4.48 (.86) | 3.25 (.81) | 3.93 (.84) | |
| Perceptual Sensitivity | 2.96 (1.27) | 4.07 (1.12) | 2.88 (1.21) | 3.62 (1.11) | |
| Negative Affectivity | 3.09 (.60) | 3.58 (.61) | 2.70 (.57) | 2.83 (.56) | |
| Sadness | 3.58 (.99) | 3.85 (.87) | 3.11 (.81) | 3.08 (.80) | |
| Distress to Limitations | 3.60 (.79) | 4.43 (.81) | 3.00 (.69) | 3.34 (.83) | |
| Fear | 2.16 (.83) | 2.96 (1.07) | 1.96 (.63) | 2.43 (.76) | |
| Falling Reactivity | 4.99 (.83) | 4.97 (.77) | 5.27 (.76) | 5.51 (.69) | |
| Orienting/Regulator Capacity | 4.75 (.59) | 4.60 (.51) | 4.83 (.57) | 4.72 (.49) | |
| Low-Intensity Pleasure | 4.84 (.97) | 4.74 (.87) | 4.91 (.92) | 4.97 (.78) | |
| Cuddliness | 5.72 (.64) | 4.81 (.69) | 5.71 (.52) | 5.18 (.60) | |
| Duration of Orienting | 3.76 (1.06) | 3.92 (1.11) | 3.67 (.94) | 3.37 (.95) | |
| Soothability | 4.70 (.73) | 4.93 (.61) | 5.02 (.77) | 5.37 (.73) | |
Notes: Results for factor scores presented in bold. Ns vary between analyses as a result of variable missing data. The Netherlands: ns = 127 (4 months) and 112 (12 months). The USA: ns = 99 (4 months) and 58 (12 months).