| Number of motions per day | ASD cases (n) | Rest of cohort (n) | OR (95% CI) | p Value |
| Characteristics at 4 weeks | ||||
| 4+ | 37.5% (27) | 27.6% (3316) | 1.18 (0.71 to 1.96) | |
| 2–3 | 45.8% (33) | 41.4% (4967) | 1.00 Reference | |
| 1 | 11.1% (8) | 24.4% (2921) | 0.42 (0.19 to 0.91) | |
| <1 | 5.6% (4) | 6.6% (791) | 0.85 (0.30 to 2.41) | 0.032 |
| Characteristics at 6 months | ||||
| 4+ | 1.4% (1) | 3.0% (337) | 0.45 (0.06 to 3.30) | |
| 2–3 | 58.0% (40) | 56.5% (6314) | 1.00 Reference | |
| 1 | 37.7% (26) | 36.9% (4129) | 1.01 (0.62 to 1.66) | |
| Once in 2–4 days or less | 2.9% (2) | 3.6% (399) | 0.85 (0.20 to 3.54) | 0.794 |
| Characteristics at 18 months | ||||
| 4+ | 2.7% (2) | 1.4% (155) | 1.52 (0.36 to 6.35) | |
| 2–3 | 58.9% (43) | 51.7% (5644) | 1.00 Reference | |
| 1 | 34.2% (25) | 45.2% (4934) | 0.76 (0.46 to 1.25) | |
| <1 | 4.1% (3) | 1.6% (176) | 2.74 (0.84 to 8.98) | 0.602 |
| Characteristics at 30 months | ||||
| 4+ | 4.2% (3) | 0.7% (74) | 3.73 (1.11 to 12.55) | |
| 2–3 | 45.1% (32) | 29.7% (2974) | 1.00 Reference | |
| 1 | 47.9% (34) | 64.7% (6468) | 0.56 (0.34 to 0.91) | |
| <1 | 2.8% (2) | 4.8% (484) | 0.51 (0.12 to 2.13) | 0.002 |
| Characteristics at 42 months | ||||
| 4+ | 4.6% (3) | 0.4% (36) | 6.46 (1.83 to 22.71) | |
| 2–3 | 38.5% (25) | 22.4% (2207) | 1.00 Reference | |
| 1 | 50.8% (33) | 70.6% (6943) | 0.42 (0.25 to 0.71) | |
| <1 | 6.2% (4) | 6.6% (645) | 0.61 (0.21 to 1.75) | <0.001 |
ASD, autistic spectrum disorder.