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Table 3 Potential predictors for age at first concerns and age at diagnosis

From: Pathways to a diagnosis of autism spectrum disorder in Germany: a survey of parents

Characteristic Age at first concerns in monthsa Age at diagnosis in monthsa
Crude linear regression β (95% CI) Multivariable linear regressionb β (95% CI) Crude linear regression β (95% CI) Multivariable linear regressionb β (95% CI)
Sex
 Male Reference Reference Reference Reference
 Female − 3.19 (− 9.90 to 3.51) − 0.69 (− 8.38 to 7.00) 1.28 (− 13.00 to 15.56) 9.67 (− 4.33 to 23.68)
Age groups in years
 0–11 Reference Reference Reference Reference
 ≥ 12 6.09 (0.86 to 11.31) 8.42 (2.16 to 14.68) 34.83 (24.84 to 44.83) 38.23 (26.92 to 49.52)
ASD diagnosis
 Childhood autism (F84.0) Reference Reference Reference Reference
 Atypical autism (F84.1) 0.37 (− 5.96 to 6.71) − 2.05 (− 9.22 to 5.12) 15.83 (2.91 to 28.76) 19.66 (6.58 to 32.73)
 Asperger syndrome (F84.5) 8.41 (2.42 to 14.41) 2.52 (− 4.94 to 9.97) 29.99 (17.86 to 42.12) 19.35 (5.71 to 32.98)
Intellectual functioning
 IQ ≥ 85 Reference Reference Reference Reference
 IQ < 85 − 12.72 (− 18.18 to − 7.27) − 12.96 (− 19.31 to − 6.62) − 15.51 (− 26.80 to − 4.21) − 15.53 (− 27.13 to − 3.93)
ADOS-2 comparison score
 Minimal to low (1–4) Reference Reference Reference Reference
 Moderate (5–7) − 5.61 (− 13.32 to 2.10) − 2.40 (− 10.17 to 5.36) − 14.51 (− 31.19 to 2.17) − 5.91 (− 20.46 to 8.63)
 High (8–10) − 6.14 (− 14.20 to 1.92) − 3.27 (− 11.38 to 4.84) − 23.44 (− 40.88 to − 5.99) − 11.43 (− 26.61 to 3.76)
Highest parental level of education
 Low/middle Reference Reference Reference Reference
 High − 3.03 (− 8.14 to 2.08) − 4.65 (− 10.41 to 1.10) − 6.09 (− 16.90 to 4.72) − 9.94 (− 20.50 to 0.62)
  1. Significant values are shown in italics
  2. a Sample size varies depending on missing values
  3. b Adjusted for all other variables shown