Appendix Table 3.
Model selection with maternal median 25(OH)D status using truncated Poisson regression to model counts of positive EH scores (EH extent)
| Model Selection Stage | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| 1 |
2 |
3 |
4 |
5 |
||||||
| Model Term | β | exp(β) | β | exp(β) | β | exp(β) | β | exp(β) | β | exp(β) |
| Maternal suff/opt 25(OH)D status | 0.39 | 1.48 | 0.32 | 1.38 | −0.01 | 0.99 | −0.05 | 0.95 | −0.09 | 0.91 |
| (−1.39, 2.29) | (0.25, 9.87) | (−1.24, 2.21) | (0.29, 9.12) | (−0.59, 0.58) | (0.55, 1.79) | (−0.61, 0.53) | (0.54, 1.70) | (−0.68, 0.47) | (0.51, 1.60) | |
| Child at birth iPTH | −0.06 | 0.94 | −0.06 | 0.94 | −0.06 | 0.94 | −0.05 | 0.95 | −0.06 | 0.94 |
| (−0.14, 0.00) | (0.87, 1.00) | (−0.11, −0.01) | (0.90, 0.99) | (−0.11, −0.01) | (0.90, 0.99) | (−0.11, 0.00) | (0.90, 1.00) | (−0.11, −0.01) | (0.90, 0.99) | |
| Child at birth 1,25/10 | 0.33 | 1.39 | 0.32 | 1.38 | 0.26 | 1.30 | 0.26 | 1.30 | 0.25 | 1.28 |
| (−0.02, 0.70) | (0.98, 2.01) | (−0.01, 0.67) | (0.99, 1.95) | (0.05, 0.45) | (1.05, 1.57) | (0.05, 0.44) | (1.05, 1.55) | (0.03, 0.44) | (1.03, 1.55) | |
| Suff/opt* Child at birth iPTH | 0.00 | 1.00 | - | - | - | - | - | - | - | - |
| (−0.10, 0.10) | (0.90, 1.11) | |||||||||
| Suff/opt* Child at birth 1,25/10 | −0.10 | 0.90 | −0.08 | 0.92 | - | - | - | - | - | - |
| (−0.51, 0.28) | (0.60, 1.32) | (−0.50, 0.28) | (0.61, 1.32) | |||||||
| Antacid count | −0.11 | 0.90 | −0.11 | 0.90 | −0.11 | 0.90 | −0.11 | 0.90 | - | - |
| (−0.25, 0.03) | (0.78, 1.03) | (−0.25, 0.02) | (0.78, 1.02) | (−0.25, 0.02) | (0.78, 1.02) | (−0.26, 0.01) | (0.77, 1.01) | |||
| Gestational age/10 | −0.03 (−0.13, 0.05) |
0.97 (0.88, 1.05) |
−0.03 (−0.12, 0.04) |
0.97 (0.89, 1.04) |
−0.04 (−0.12, 0.04) |
0.96 (0.89, 1.04) |
- | - | - | - |
| Maternal age | 0.16 | 1.17 | 0.16 | 1.17 | 0.13 | 1.14 | 0.12 | 1.13 | 0.13 | 1.14 |
| (−0.31, 0.65) | (0.73, 1.92) | (−0.33, 0.68) | (0.72, 1.97) | (−0.35, 0.65) | (0.70, 1.92) | (−0.34, 0.63) | (0.71, 1.88) | (−0.35, 0.16) | (0.70, 1.17) | |
| Log(maternal BMI) | −0.41 | 0.66 | −0.33 | 0.72 | −0.25 | 0.78 | −0.49 | 0.61 | −0.53 | 0.59 |
| (−1.74, 0.56) | (0.18, 1.75) | (−1.47, 0.66) | (0.23, 1.93) | (−1.35, 0.68) | (0.26, 1.97) | (−1.30, 0.17) | (0.27, 1.19) | (−1.35, 0.16) | (0.26, 1.17) | |
| Maternal race/ethnicity: Caucasian | 0.14 | 1.15 | 0.12 | 1.13 | 0.17 | 1.19 | 0.07 | 1.07 | 0.06 | 1.06 |
| (−0.74, 1.85) | (0.48, 6.36) | (−0.68, 1.63) | (0.51, 5.10) | (−0.96, 2.48) | (0.38, 11.94) | (−0.87, 2.47) | (0.42, 11.82) | (−0.78, 1.21) | (0.46, 3.35) | |
| Maternal race/ethnicity: African American | 0.12 | 1.13 | 0.08 | 1.08 | 0.12 | 1.13 | 0.05 | 1.05 | 0.03 | 1.03 |
| (−0.75, 1.75) | (0.47, 5.75) | (−0.73, 1.53) | (0.48, 4.62) | (−1.08, 2.41) | (0.34, 11.13) | (−0.95, 1.18) | (0.39, 3.25) | (−0.91, 1.23) | (0.40, 3.42) | |
| Maternal race/ethnicity: Hispanic | 0.10 | 1.11 | 0.07 | 1.07 | 0.12 | 1.13 | 0.00 | 1.00 | 0.05 | 1.05 |
| (−0.88, 1.70) | (0.41, 5.47) | (−0.74, 1.50) | (0.48, 4.48) | (−1.05, 2.48) | (0.35, 11.94) | (−1.04, 1.10) | (0.35, 3.00) | (−0.81, 1.21) | (0.44, 3.35) | |
| DIC | 309.5 | 309.3 | 309.6 | 309.3 | 310.1 | |||||
The model coefficients (β) from the backwards model selection are displayed along with their 95% credible intervals. Each coefficient and interval is exponentiated to provide the multiplicative effect on the expected counts of EH. A dash (−) indicates that the variable was removed for that stage of selection. The abbreviation maternal suff/opt represents the dummy variable for the sufficient or optimal median 25(OH)D status; iPTH represents the cord blood iPTH concentration (pg/mL), and 1,25/10 represents the child cord blood measurement of 1,25(OH)2D (pg/mL) divided by 10.