Table 3.
Summary of variation between datasets in demographic, behavioural characteristics and level of ASD symptomatology (split by ADOS and ADI-R datasets)
| Ranges across datasets | Variance | x2 sig. value | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Minimum | Maximum | Mean | SD | Overall mean (SD) | Within datasets | Between datasets | ICC d | ||
| Chronological age [years:months] | 1:0–23:7a | 2:5–65:3 | 2:0–39:5 | 0:3–11:8 | 7:4 (7:5) | 98.6 | 14.84 | .87 | p < .0001 |
| 1:5–25:8b | 3:8–60:9 | 2:7–40:8 | 0:2–9:7 | 11:2 (8:9) | 69.29 | 23.67 | .75 | p < .0001 | |
| 2:0–25:8c | 6:1–60:9 | 4:3–40:8 | 0:7–9:7 | 10:7 (5:5) | 99.58 | 14.92 | .87 | p < .0001 | |
| Sex, % of male participants | 58.8–100a | 83.6 (3.7) | 0.38 | 0.12 | .01 | p = .017 | |||
| 71.4–100b | 82.4 (3.8) | 0.37 | 0.04 | .01 | p = .004 | ||||
| 70.0–100c | 83.9 (3.7) | 0.38 | 0.04 | .05 | p = .0002 | ||||
| Nonverbal IQ | 25–73a | 92–148 | 54–115 | 11–27 | 74 (26) | 294.28 | 490.83 | .38 | p < .0001 |
| 25–75b | 99–154 | 55–109 | 14–32 | 80 (27) | 222.53 | 478.24 | .32 | p < .0001 | |
| 25–71c | 108–154 | 69–109 | 81 (28) | 257.56 | 513.55 | .33 | p < .0001 | ||
| ADOS—CSS | |||||||||
| Total | 1–4 | 8–10e | 3–7 | 1–3 | 6 (2) | 0.62 | 4.79 | .11 | p < .0001 |
| SA | 1–6 | 9–10e | 4–8 | 1–3 | 7 (2) | 0.38 | 4.85 | .07 | p < .0001 |
| RRB | 1–5 | 6–10e | 4–7 | 0–3 | 6 (2) | 0.81 | 5.73 | .12 | p < .0001 |
| ADI-R—ever/diagnostic | |||||||||
| Social interaction | 0–10 | 21–30 | 9–22 | 4–7 | 17 (7) | 10.57 | 35.18 | .23 | p < .0001 |
| Communication | 0–7 | 15–27 | 9–14 | 3–5 | 12 (5) | 3.43 | 20.15 | .15 | p < .0001 |
| RRB | 0–2 | 7–18 | 1–9 | 1–4 | 5 (3) | 2.28 | 7.15 | .24 | p < .0001 |
| ADI-R—current | |||||||||
| Social interaction | 0–2 | 13–30 | 5–17 | 4–8 | 12 (6) | 10.24 | 30.60 | .25 | p < .0001 |
| Communication | 0–4 | 13–24 | 5–13 | 3–5 | 9 (4) | 1.40 | 15.54 | .08 | p < .0001 |
| RRB | 0–1 | 8–12 | 3–5 | 2–3 | 4 (2) | 0.65 | 5.43 | .11 | p < .0001 |
| Sample size | 4a | 199 | 74 | 62 | |||||
| 8b | 274 | 98 | 78 | ||||||
| 8c | 220 | 96 | 77 | ||||||
ICC intraclass correlation coefficient, ADI—R Autism Diagnostic Interview—Revised, ADOS CSS Total, SA, RRB Autism Diagnostic Observation Schedule Calibrated Severity Scores for total, social affect and restricted and repetitive behaviours, IQ intelligence quotient
aIndicators in row relate to ADOS datasets only
bIndicators in row relate to ADI-R 4–5 ever/diagnostic datasets only
cIndicators in row relate to ADI-R 4–5 current datasets only
dThe ratio of between-dataset variance to total variance
eThe highest possible score (i.e. ceiling) on the instrument