Table 1.
Mean differences between FH+ and FH− groups on demographic characteristics.
|
FH+ (n= 37) |
FH− (n= 75) |
|||||
|---|---|---|---|---|---|---|
| Characteristic | M | SD | M | SD | t | p |
| Maternal age | 34.62 | 3.60 | 31.74 | 4.85 | −3.37 | .001 |
| Paternal age | 36.77 | 4.35 | 33.73 | 4.89 | −3.08 | .003 |
| Maternal education | 3.83 | 0.43 | 3.76 | 0.48 | −0.33 | .740 |
| Paternal education | 3.74 | 0.62 | 3.63 | 0.64 | −0.91 | .362 |
| Hollingshead Four Factor Index (SES) | 56.70 | 8.99 | 55.89 | 9.02 | −1.27 | .204 |
| Number of children | 2.54 | .95 | 1.98 | 0.87 | 7.56 | .007 |
| Number of sons | 1.41 | 1.14 | 1.07 | 0.91 | −1.59 | .115 |
| Number of daughters | 1.13 | 0.94 | 0.92 | 0.86 | −1.46 | .148 |
| Birth weight | 3,421.22 | 762 | 3,241.19 | 776 | −1.25 | .210 |
| Gestational age | 39.00 | 2.90 | 38.50 | 2.30 | −1.02 | .312 |
Note. FH+ = positive family history of specific language impairment (SLI); FH− = negative family history of SLI; SES = socioeconomic status.