Table 4. Cox Regressions comparing children implanted prior to vs. after age two in relation to hearing peers.
| Oral Language | Symbolic Play | Noun Class | ||||
|---|---|---|---|---|---|---|
| Estimate (SE) | HR | Estimate (SE) | HR | Estimate (SE) | HR | |
| Contrasts | ||||||
| Hearing all ages | 2.15 (0.28)* | 8.58 (4.85 to 15.17) | -0.17 (0.21) | 0.84 (0.56 to 1.26) | 0.93 (0.22)* | 2.54 (1.65 to 3.91) |
| Implanted before age 2 | Reference group | – | Reference group | – | Reference group | – |
| Implanted after age 2 | -1.46 (0.20)* | 0.23 (0.16 to 0.35) | -0.75 (0.20)* | 0.47 (0.32 to 0.70) | -1.71 (0.22)* | 0.18 (0.11 to 0.27) |
| Control Variables | ||||||
| Maternal Education (years) | 0.27 (0.04)* | 1.31 (1.20 to 1.43) | 0.11 (0.05) | 1.01 (0.92 to 1.10) | 0.17 (0.05)* | 1.19 (1.08 to 1.31) |
| Child’s Gender (0 = Male; 1 = Female) | -0.06 (0.15) | 1.06 (0.80 to 1.40) | 0.39 (0.17)* | 1.47 (1.07 to 2.04) | 0.38 (0.17)* | 1.46 (1.05 to 2.01) |
| Child’s IQ (in standard deviation units) | 0.13 (0.06)* | 1.14 (1.01 to 1.28) | -0.04 (0.06) | 0.97 (0.86 to 1.09) | 0.17 (0.06)* | 1.18 (1.05 to 1.34) |
SE = Standard Error; HR = Hazard Ratio.
* p < .05.