TABLE 1

Demographic, Referral, and M-CHAT Scores Among the Total Sample and by Documentation of ASD Diagnosis

Total Sample (N = 491)No Documented ASD (N = 395)Documented ASD (N = 96)
n (%)Mean (SD)n (%)Mean (SD)n (%)Mean (SD)
Sex
 Male303 (61.7)226 (57.2)*77 (80.2)*
 Female188 (38.3)169 (42.8)*19 (19.8)*
Race and ethnicity
 White155 (31.6)121 (30.6)34 (35.4)
 Hispanic168 (34.2)142 (35.9)26 (27.1)
 African American78 (15.9)58 (14.7)20 (20.8)
 Asian American51 (10.4)38 (9.6)13 (13.5)
 Other39 (7.9)36 (9.1)3 (3.1)
English speaking452 (92.1)360 (91.1)92 (95.8)
Insurance
 None10 (2.0)9 (2.3)1 (1.0)
 Private293 (59.7)228 (57.7)65 (67.7)
 Public188 (38.3)158 (40.0)30 (31.3)
Failed M-CHAT at both 18- and 24-mo visitsa112 of 356 (31.5)63 of 279 (22.6)*49 of 77 (63.6)*
M-CHAT scores
 18-mo visit5.0 (4.1)4.5 (3.7)*7.3 (4.9)*
 24-mo visit4.3 (4.5)3.3 (3.9)*7.6 (5.1)*
Age at ASD diagnosis, mo33.8 (9.7)33.8 (9.7)
Age at first specialist referral, mo26.1 (8.7)27.3 (10.0)25.3 (7.6)
Age at second specialist referral, mo36.3 (8.5)36.9 (10.1)35.7 (7.2)
  • Total sample for these comparisons includes all children who failed the M-CHAT at either or both the 18- and 24-month visit, excluding the 2 children who died and those who were lost to follow-up, for a total of 491 children. —, not applicable.

  • a Data were missing for 135 children for this comparison because not all children had both an 18- and 24-month M-CHAT on file.

  • * P < .001.