Table 1. Correlations Between Study Variables.
| Variable | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | Group Status | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
| ||||||||||||||||||
| Control | Smoking | |||||||||||||||||
|
| ||||||||||||||||||
| M (SD) | M (SD) | |||||||||||||||||
| 1. Maternal age | --- | 23.30 (4.90) | 24.34 (4.96) | |||||||||||||||
| 2. Level of Maternal education | 20** | --- | 2.39 (1.11) | 2.24 (1.10) | ||||||||||||||
| 3. Gendera | -.02 | .05 | --- | .54 (.50) | .45 (.50) | |||||||||||||
| 4. Birth weight | .07 | .11 | -.09 | --- | 3.36 (.55) | 3.18 (.58)* | ||||||||||||
| 5. Head circumference | .08 | .13* | -.10 | .64*** | --- | 34.44 (1.83) | 33.75 (1.84)* | |||||||||||
| 6. Small for gestational ageb | .00 | .01 | .09 | -.46*** | -.31*** | --- | .13 (.34) | .14 (.35) | ||||||||||
| 7. Prenatal smoking | 18** | -.11 | -.11 | -.08 | -.08 | -.02 | --- | .00 (.00) | 5.07 (4.78)*** | |||||||||
| 8. Prenatal marijuana | -.05 | -.13* | .12 | -.15* | -.16* | .10 | .16* | --- | .06 (.30) | .31 (.69)*** | ||||||||
| 9. Prenatal alcohol | .01 | .01 | .04 | -.12 | -.07 | .06 | 18** | .13* | --- | .01 (.04) | .08 (.19)*** | |||||||
| 10. FA global rating | .02 | -.04 | .04 | -.03 | .10 | .02 | -.02 | -.14* | -.09 | --- | 2.75 (.63) | 2.65 (.53) | ||||||
| 11. FA duration | -.02 | -.02 | .03 | -.03 | .08 | .02 | .00 | -.13 | -.08 | .91*** | --- | 34.70 (13.03) | 33.93 (12.32) | |||||
| 12. FA latency | -.04 | .09 | -.13 | -.09 | -.10 | .02 | .08 | -.07 | -.03 | -.14* | -.19** | --- | .44 (2.77) | .81 (3.44) | ||||
| 13. Activity level | -.03 | .01 | -.06 | .07 | .07 | -.06 | .12 | .03 | .06 | -.38*** | -.29*** | .00 | --- | 2.29 (.54) | 2.28 (.55) | |||
| 14. Dropped toy | -.01 | .04 | -.13* | .04 | .09 | -.03 | -.07 | -.04 | -.03 | -.09 | -.10 | .02 | -.00 | --- | .63 (2.42) | .35 (.55) | ||
| 15. Baseline behavioral state | -.11 | .12 | .04 | .06 | .05 | .01 | -.06 | .06 | .04 | -.10 | -.11 | .01 | .24*** | .00 | --- | 2.61 (.69) | 2.56 (.69) | |
| 16. Behavioral state during task | .02 | .11 | -.03 | -.02 | -.03 | -.05 | -.02 | .03 | .03 | -.36*** | - 34*** | .29*** | .38*** | .11 | .24*** | --- | 2.92 (.35) | 2.93 (.39) |
| 17. HR during OM | .04 | -.05 | .09 | -.07 | -.11 | .00 | .03 | .00 | .00 | -.12 | -.14* | .13 | .14* | .11 | .12 | -.05 | 129.85 (9.50) | 129.42 (11.22) |
Notes: HR = Heart Rate; OM= Object Manipulation;
*
p < .05;
**
p < .01;
***
p < .001;
a
0 = Male, 1 = Female;
b
0 = Not small for gestational age, 1 = small for gestational age