Table 2.
Bayley Scales of lnfant Development-H (BSID-II) and Habituation Adjusted Means and Standard Deviations by Group
| High cocaine |
Low cocaine |
Nonexposed |
||||
|---|---|---|---|---|---|---|
| Outcome variable | M | SD | M | SD | M | SD |
| BSID-II | ||||||
| MDI (8 months) | 94.59 | 8.91 | 91.30 | 7.05 | 92.48 | 7.57 |
| MDI (18 months)* | 79.05 | 10.21a | 86.59 | 9.76b | 83.09 | 13.18b |
| PDI (8 months) | 87.33 | 9.93 | 89.99 | 8.70 | 95.20 | 12.82 |
| Habituation measures (in s) | ||||||
| Baseline | 4.79 | 2.12 | 4.60 | 1.72 | 3.92 | 2.38 |
| Habituation | 3.65 | 1.48 | 3.50 | 1.55 | 3.29 | 2.02 |
| Recovery to novelty | 4.62 | 4.07 | 2.90 | 1.69 | 4.57 | 2.82 |
| Rebabituation | 2.27 | 1.26 | 2.49 | 1.14 | 3.44 | 2.05 |
| Time to habituation | 35.57 | 17.64 | 33.78 | 19.60 | 29.31 | 18.05 |
| No. of trials to habituation | 8.38 | 3.22 | 9.57 | 5.21 | 8.72 | 2.75 |
Note. There were 112 infants with complete Bayley data at both ages: 15 in high cocaine, 19 in low cocaine, 78 in nonexposed groups. There were 156 infants with complete habituation data: 20 in high cocaine, 19 in low cocaine, and 117 in nonexposed groups. MDI = Mental Development Index; PDI = Psychomotor Development Index. Values with different subscripts are significantly different at p < .05, Tukey Multiple Range Test.
*
p < .05.