TABLE 2

Logistic Regression of Variables Predicting Stuttering Status (Stuttering Onset vs Not Stuttering) by 4 Years

VariableUnadjusted (n ranges from 1447 to 1619)Adjusted (n = 1355)
NOR95% CIPOR95% CIP
Male gender16191.421.04 to 1.94.031.511.07 to 2.13.02
Premature birth (<36 wk)16191.140.48 to 2.72.771.150.42 to 3.15.78
Twin birth16192.941.45 to 5.95.0033.261.44 to 7.40.005
Birth wt, kg15930.990.74 to 1.33.960.970.67 to 1.40.88
Has older siblings16150.800.58 to 1.09.150.810.58 to 1.14.23
Family history1619.13.07
 No problemrefref
 Speech/language/reading problems only0.730.48 to 1.130.820.52 to 1.31
 Stuttering problem1.470.82 to 2.621.901.01 to 3.57
SEIFA disadvantage score (per 100 unit increase)16181.441.08 to 1.93.011.140.83 to 1.55.43
Mother’s education level1602<.001.004
 Did not complete Year 12refref
 Completed Year 121.090.68 to 1.750.990.59 to 1.64
 Degree/postgraduate qualification2.081.34 to 3.221.751.08 to 2.85
Maternal mental health score14690.990.93 to 1.04.601.010.95 to 1.07.81
Temperament: approach/withdrawal at 2 y14891.000.96 to 1.03.781.010.98 to 1.04.62
CSBS total score at 2 y (per 15 unit increase)14471.261.07 to 1.47.0051.221.00 to 1.48.05
CDI raw expressive vocabulary score at 2 y (per 100 unit increase)14741.090.99 to 1.20.081.050.94 to 1.19.37
  • CDI, Communicative Development Inventory; CSBS, Communication and Symbolic Behavior Scales: OR, odds ratio; ref, reference.