Table 6.
Regression and Non-regression cases: background factors
| Variables | R (n = 62)a | NR (n = 241)b | Statistic | p |
|---|---|---|---|---|
| Background | ||||
| Male (F (%)) | 54 (87.1) | 200 (83.0) | 0.614c | 0.433 |
| Age at T1-years (M (SD)) | 3.5 (0.68) | 3.5 (0.76) | 0.216d | 0.829 |
| Age at T2-years (M (SD)) | 5.4 (0.65) | 5.4 (0.69) | 0.316d | 0.752 |
| Parents have different ethnicity (F (%)) | 17 (27.4) | 49 (20.5) | 1.376c | 0.241 |
| Any NDD in first degree relative? (F (%)) | 24 (38.7) | 95 (39.4) | 0.010c | 0.919 |
| Number siblings (M (SD)) | 1.30 (0.80) | 1.28 (0.90) | − 0.088d | 0.930 |
| Birth order (M (SD)) | 1.77 (0.89) | 1.77 (0.85) | 0.031d | 0.975 |
| Any maternal disease in pregnancy? (F (%))e | 27 (48.2) | 90 (41.1) | 0.924c | 0.336 |
| Gestational age (M (SD)) | 39.22 (2.81) | 39.11 (2.10) | − 0.317d | 0.751 |
| Born at term (37–41 weeks)? (F (%)) | 46 (74.2) | 201 (83.4) | 2.785c | 0.248 |
| Caesarean section? (F (%)) | 16 (25.8) | 60 (25.4) | 0.004c | 0.951 |
| Neonatal care? (F (%)) | 9 (14.8) | 50 (21.7) | 1.455c | 0.228 |
| Age walking − months (M (SD)) | 13.4 (2.72) | 14.4 (4.51) | 2.188d | 0.030 |
| Toe walking? (F (%)) | 24 (38.7) | 74 (30.7) | 1.444c | 0.230 |
| Feeding problems first 2 years? (F (%)) | 18 (29.0) | 66 (27.4) | 0.067c | 0.796 |
Significant p value (p < .01) is highlighted in bold
NDD Neurodevelopmental Disorder
aSpecific N for each variable ranged from 56 to 62
bSpecific N for each variable ranged from 219 to 241
cchi-squared test
dt-test
eGbg data from single variable; Stk data compiled from more detailed data: chronic condition, acute condition, and/or pharmacological intervention in pregnancy