Table 2.
The folding patterns * sex cross tabulation and chi-square test results. ‘%’ is the percentage within patterns. ‘p-value’ denotes the 2-sided asymptotic significance of Pearson chi-square test. The significance value highlighted in bold means that sex difference (p-value < 0.05) was observed in the corresponding region. (Each percentage in the bracket denotes the ratio of the number of male (female) infants in each pattern to the total number of male (female) infants.)
| Region | Pattern | Male (%) | Female (%) | Total | p-value |
|---|---|---|---|---|---|
| Superior Temporal Gyrus | Pattern 1 | 108 (35.1%) | 108 (37.6%) | 216 | 0.001 |
| Pattern 2 | 72 (23.4%) | 77 (26.8%) | 149 | ||
| Pattern 3 | 47 (15.2%) | 63 (22.0%) | 110 | ||
| Pattern 4 | 81 (26.3%) | 39 (13.6%) | 120 | ||
| Precuneus | Pattern 1 | 137 (44.5%) | 147(51.2%) | 284 | 0.154 |
| Pattern 2 | 93 (30.2%) | 68 (23.7%) | 161 | ||
| Pattern 3 | 78 (25.3%) | 72 (25.1%) | 150 | ||
| Inferior Frontal Gyrus | Pattern 1 | 83 (26.9%) | 67 (23.3%) | 150 | 0.022 |
| Pattern 2 | 88 (28.6%) | 88 (30.7%) | 176 | ||
| Pattern 3 | 82 (26.6%) | 101 (35.2%) | 183 | ||
| Pattern 4 | 55 (17.9%) | 31 (10.8%) | 86 | ||
| Cingulate Cortex | Pattern 1 | 47 (15.3%) | 71 (24.7%) | 118 | 0.015 |
| Pattern 2 | 52 (16.9%) | 47 (16.4%) | 99 | ||
| Pattern 3 | 53 (17.2%) | 58 (20.2%) | 111 | ||
| Pattern 4 | 79 (25.6%) | 58 (20.2%) | 137 | ||
| Pattern 5 | 77 (25.0%) | 53 (18.5%) | 130 |