Table 1.
Participant information and ADBB scores across the three waves.
| Wave 1n = 14,570 | Wave 2n = 11,608 | Wave 3n = 13,088 | |
|---|---|---|---|
| Sex, girl, % (n) | 49 (7,099) | 49 (5,375) | 49 (6,407) |
| Gestational age, weeks, M (SD) | 39.8 (1.6) | 39.7 (2.1) | 39.7(2.0) |
| Missing, n | 254 | 283 | 380 |
| Birth weight, grams, M (SD) | 3473 (526) | 3417 (538) | 3458 (537) |
| Missing, n | 172 | 294 | 356 |
| Maternal age, years, M (SD) | 32.2 (4.6) | 31.7 (4.7) | 32.1 (4.7) |
| Missing, n | 37 | 13 | 10 |
| Paternal age, years, M (SD) | 34.4 (5.8) | 33.7 (5.8) | 34.3 (5.7) |
| Missing, n | 416 | 359 | 332 |
| Infant age, months, M (SD) | 2.4 (0.5) | 5.0 (1.2) | 8.6 (0.6) |
| Prevalence of ADBB scores | |||
| 1. Facial expressions ≠ 0, % (n) | 6.6 (963) | 5.4 (628) | 4.2 (546) |
| 2. Eye contact ≠ 0, % (n) | 7.6 (1111) | 2.6 (304) | 1.6 (210) |
| 3. General activity level ≠ 0, % (n) | 4.0 (588) | 3.7 (429) | 2.3 (300) |
| 4. Self-stimulating gestures ≠ 0, % (n) | 0.7 (100) | 0.9 (109) | 0.7 (94) |
| 5. Vocalizations ≠ 0, % (n) | 15.8 (2295) | 16.9 (1964) | 13.1 (1710) |
| 6. Briskness of response to stimulation ≠ 0, % (n) | 1.2 (179) | 0.8 (93) | 0.7 (88) |
| 7. Relationship ≠ 0, % (n) | 9.6 (1396) | 5.5 (633) | 4.4 (582) |
| 8. Attraction ≠ 0, % (n) | 10.5 (1525) | 6.1 (707) | 4.2 (554) |
Note. ADBB = Alarm Distress Baby Scale. ≠ 0 = the percentage of infants with slightly to very unusual behavior.