TABLE 2

Comparison of M-CHAT Scores According to Level of Study Participation

VariableNMean (95% CI)t Test, PTOST
t1 Pt2P
Overalla<.001<.001>.99
 M-CHAT fail3415.0 (4.7–5.3)
 M-CHAT pass47300.4 (0.4–0.4)
M-CHAT failb.78.003<.001
 Without M-CHAT/F1445.0 (4.5–5.5)
 With M-CHAT/F1975.0 (4.6–5.4)
M-CHAT/F completeda.03<.001.40
 Not in study984.5 (4.0–5.0)
 In study995.4 (4.8–6.0)
M-CHAT/F failc.67.26.07
 Not in study218.1 (6.5–8.7)
 In study407.7 (6.6–8.8)
M-CHAT/F passb.17<.001.002
 Not in study773.5 (3.3–3.7)
 In study593.8 (3.4–4.3)
  • Comparisons were made with 2-tailed t test and TOST, Δ = 1 point. CI, confidence interval.

  • a Relevant difference.

  • b Equivalence.

  • c Indeterminate (underpowered).