Table 1.
Mean IQ (SD) and correlations before and after adoption
| SES | Late adoptees
|
|||||
|---|---|---|---|---|---|---|
| Mean IQ
|
IQ correlation
|
|||||
| Before adoption | After adoption | Difference* | r | rc | Early adoptees | |
| n = 10 | ||||||
| LowFIQ | 77.83 (6.8) | 85.54 (17.0) | 7.71 (15.2)‡ | 0.45† | 0.71§ | 92.4 (15.4) |
| n = 24VIQ | 84.54 (15.5) | 92.1 (17.2) | ||||
| PIQ | 89.71 (18.2) | 94.0 (12.2) | ||||
| MiddleFIQ | 76.45 (6.5) | 92.23 (11.3) | 15.77 (10.2)§ | 0.45† | 0.72§ | |
| n = 22VIQ | 91.55 (12.1) | |||||
| PIQ | 94.73 (13.5) | n = 10 | ||||
| HighFIQ | 78.53 (5.7) | 98.00 (14.6) | 19.47 (13.9)§ | 0.31 | 0.61§ | 103.6 (12.2) |
| n = 19VIQ | 93.26 (16.7) | 105.1 (12.4) | ||||
| PIQ | 103.84 (12.5) | 101.1 (12.0) | ||||
| TotalFIQ | 77.57 (6.3) | 91.45 (15.2) | 13.88 (14.0)§ | 0.39 | 0.67§ | |
| n = 65VIQ | 89.46 (15.1) | |||||
| PIQ | 95.54 (16.0) | |||||
rc, Correlation estimated for restriction34 range where SD for an unrestricted range of IQ before adoption is 13.429. *Difference between IQ mean before and after adoption; P levels are computed from t for dependent sample;
P < 0.05;
P < 0.02;
P < 0.001. Summary of all effects for the design: SES, Early vs. Late adoptees (EL) on FIQ: SES [F (1,59) = 7.98, P = 0.006)], EL [F (1,59) = 2.21, P = 0.14], SES × EL [F (1,59) = 0.2, P = 0.88)]. Summary of all effects for the design: SES on Verbal vs. Performance (VP) IQs as repeated measures. SES [F (2,62) = 4.02, P = 0.02)], VP [F (1, 62) = 12.65, P = 0.0007], SES × VP: [F (1,62) = 1.45, P = 0.24]. Summary of all effects for the design: SES, EL on VP as repeated measures: SES (F = 8.1, P = 0.006), EL (F = 1.92, P = 0.17), VP (F = 3.89, P = 0.05), SES × EL (F = 0.03, P = 0.85), SES × VP (F = 0.005, P = 0.94), EL × VP (F = 6.65, P = 0.01), SES × EL × VP: (F = 2.68, P = 0.11). The df effect and df error are 1 and 59.