Table 1.
Sample characteristics.
| Homozygotic 192/192 N = 109 |
Heterozygotic 192/x N = 138 |
Noncarrier x/x N = 31 |
P* | |
|---|---|---|---|---|
| Sociodemographics | ||||
| Age, mean years (SD) | 42.4 (0.8) | 42.3 (0.7) | 42.4 (0.9) | 0.76 |
| % female | 56.0 | 50.7 | 51.6 | 0.71 |
| BMI, mean kilograms/meters2 (SD) | 24.5 (3.7) | 24.8 (3.8) | 24.6 (2.7) | 0.78 |
| Alleles | ||||
| 176, N | 0 | 1 | 1 | — |
| 186, N | 0 | 0 | 0 | — |
| 188, N | 0 | 9 | 7 | — |
| 190, N | 0 | 16 | 12 | — |
| 192, N | 218 | 138 | 0 | — |
| 194, N | 0 | 84 | 25 | — |
| 196, N | 0 | 22 | 14 | — |
| 198, N | 0 | 6 | 3 | — |
| IGF-1, mean nml/liter (SD) | 22.6 (5.4) | 24.4 (5.5) | 25.1 (5.4) | 0.01 |
*Based on χ 2 and ANOVA statistics for dichotomous or categorical and continuous measures, respectively.
SD: standard deviation, BMI: body mass index, PAL: paired associates learning, SWM: spatial working memory, GIT: Groninger intelligentietest test, and NLV: Nederlandse Leestest voor Volwassenen.