Table 4. Logistic Regression Analysis of the Association of Demographic and Clinical Characteristics With Bayley Scales of Infant and Toddler Development, Third Edition, Scores.
| Characteristic | Model 1: demographic variables | Model 2: demographic variables and clinical variables | Model 3: demographic, clinical variables, and head circumference at birth | |||
|---|---|---|---|---|---|---|
| β (SE) | P value | β (SE) | P value | β (SE) | P value | |
| Cognitive scores | ||||||
| Sex | ||||||
| Girls | −0.801 (1.92) | .68 | −0.363 (1.845) | .84 | −0.024 (1.831) | .99 |
| Boys | 0 [Reference] | 0 [Reference] | 0 [Reference] | |||
| Age | −0.323 (0.537) | .55 | −0.143 (0.516) | .78 | −0.339 (0.519) | .52 |
| Maternal age at birth | 0.151 (0.136) | .27 | 0.133 (0.134) | .32 | 0.113 (0.135) | .40 |
| Household income | 0.942 (1.182) | .438 | 1.070 (1.132) | .35 | 0.486 (1.153) | .68 |
| Birth weight | NA | NA | 7.653 (2.122) | .001 | 4.055 (2.674) | .13 |
| Gestational age | NA | NA | −0.916 (0.555) | .10 | −0.869 (0.549) | .12 |
| Head circumference at birth | NA | NA | NA | NA | 1.405 (0.668) | .04 |
| Receptive communication scores | ||||||
| Sex | ||||||
| Girls | −0.137 (0.648) | .83 | −0.019 (0.629) | .98 | 0.071 (0.631) | .91 |
| Boys | 0 [Reference] | NA | 0 [Reference] | NA | 0 [Reference] | NA |
| Age | 0.097 (0.182) | .59 | 0.147 (0.176) | .40 | 0.165 (0.179) | .36 |
| Maternal age at birth | 0.096 (0.046) | .04 | 0.095 (0.046) | .04 | 0.110 (0.047) | .02 |
| Household income | 0.084 (0.399) | .83 | 0.102 (0.386) | .79 | 0.154 (0.397) | .70 |
| Birth weight | NA | NA | 2.269 (0.723) | .002 | 2.292 (0.921) | .02 |
| Gestational age | NA | NA | −0.222 (0.189) | .25 | −0.198 (0.189) | .30 |
| Head circumference at birth | NA | NA | NA | NA | −0.062 (0.230) | .79 |
| Expressive communication scores | ||||||
| Sex | ||||||
| Girls | −0.235 (0.726) | .75 | −0.103 (0.714) | .89 | −0.012 (0.722) | .99 |
| Male | 0 [Reference] | NA | 0 [Reference] | NA | 0 [Reference] | NA |
| Age | −0.005 (0.204) | .98 | 0.023 (0.200) | .91 | 0.016 (0.205) | .94 |
| Maternal age at birth | 0.006 (0.051) | .91 | −0.016 (0.052) | .76 | −0.008 (0.053) | .88 |
| Household income | 0.359 (0.448) | .43 | 0.450 (0.438) | .31 | 0.430 (0.455) | .35 |
| Birth weight | NA | NA | 2.304 (0.822) | .006 | 1.989 (1.055) | .06 |
| Gestational age | NA | NA | −0.131 (0.215) | .54 | −0.111 (0.217) | .61 |
| Head circumference at birth | NA | NA | NA | NA | 0.088 (0.264) | .74 |
| Fine motor scores | ||||||
| Sex | ||||||
| Girls | 0.488 (1.384) | .73 | 0.629 (1.367) | .65 | 0.841 (1.335) | .53 |
| Boys | 0 [Reference] | NA | 0 [Reference] | NA | 0 [Reference] | NA |
| Age | 0.198 (0.388) | .61 | 0.282 (0.382) | .46 | 0.082 (0.378)) | .83 |
| Maternal age at birth | 0.122 (0.098) | .22 | 0.107 (0.099 | .28 | 0.073 (0.099 | .46 |
| Household income | 0.236 (0.853) | .78 | 0.319 (0.838)) | .70 | −0.274 (0.841) | .75 |
| Birth weight | NA | NA | 4.284 (1.572) | .008 | 0.956 (1.950) | .63 |
| Gestational age | NA | NA | −0.405 (0.411) | .33 | −0.388 (0.401) | .34 |
| Head circumference at birth | NA | NA | NA | NA | 1.359 (0.487) | .007 |
| Gross motor scores | ||||||
| Sex | ||||||
| Girls | −0.590 (1.745) | .74 | −0.529 (1.754) | .76 | −0.165 (1.747) | .93 |
| Boys | 0 [Reference] | NA | 0 [Reference] | NA | 0 [Reference] | NA |
| Age | −0.292 (0.489) | .55 | −0.218 (0.491) | .66 | −0.367 (0.495) | .46 |
| Maternal age at birth | 0.000 (0.123) | >.99 | −0.049 (0.127) | .70 | −0.053 (0.129) | .68 |
| Household income | 1.335 (1.076) | .22 | 1.537 (1.076) | .16 | 1.094 (1.100) | .32 |
| Birth weight | NA | NA | 4.284 (2.017) | .04 | 1.291 (2.551) | .61 |
| Gestational age | NA | NA | −0.492 (0.528) | .35 | −0.432 (0.524) | .41 |
| Head circumference at birth | NA | NA | NA | NA | 1.122 (0.638) | .08 |
Abbreviation: NA, not applicable.