Supplemental Material 1 K1-K19: items number of Mini-K-J IPC = Insight, Planning, and Control MFRQ = Mother/Father Relationship Quality FRIEND = Friend Social Contact/Support FAMILY = Family Social Contact/Support PB = Pair-bonding K = K-factor Note. K-factor loadings on each lower-factor were constraint across sex. Intercepts of observed variables were constraint across sex. Intercepts of lower-order factors were not constraint across sex except for IPC, and these lower-order factors were higher in females than males. Variances of K-factor were freely estimated across sex. Factor means were freely estimated across sex, and no sex differences. Residual variances of observed variables were freely estimated across sex. Unstandardized Parameter Estimates Two-Tailed Estimate S.E. Est./S.E. P-Value Group FEMALE IPC BY K2 1.000 0.000 999.000 999.000 K3 1.272 0.220 5.776 0.000 K4 1.770 0.279 6.353 0.000 K5 1.398 0.231 6.052 0.000 MFRQ BY K7 1.000 0.000 999.000 999.000 K8 0.947 0.087 10.883 0.000 FRIEND BY K16 1.000 0.000 999.000 999.000 K17 1.127 0.072 15.712 0.000 K18 0.913 0.062 14.638 0.000 K19 0.638 0.074 8.634 0.000 FAMILY BY K13 1.000 0.000 999.000 999.000 K14 1.234 0.075 16.488 0.000 K15 1.135 0.068 16.713 0.000 PB BY K11 1.000 0.000 999.000 999.000 K12 0.964 0.165 5.828 0.000 K BY IPC 1.000 0.000 999.000 999.000 MFRQ 2.063 0.378 5.458 0.000 FRIEND 1.939 0.354 5.481 0.000 FAMILY 1.584 0.314 5.038 0.000 PB 1.097 0.293 3.737 0.000 Means K 0.000 0.000 999.000 999.000 Intercepts K2 5.035 0.067 75.317 0.000 K3 4.314 0.085 50.492 0.000 K4 4.368 0.082 53.473 0.000 K5 4.447 0.084 52.866 0.000 K7 5.942 0.081 73.488 0.000 K8 5.565 0.091 61.327 0.000 K11 6.043 0.085 71.165 0.000 K12 5.520 0.105 52.352 0.000 K13 3.935 0.104 37.666 0.000 K14 4.819 0.107 45.129 0.000 K15 4.372 0.100 43.811 0.000 K16 5.729 0.081 71.044 0.000 K17 5.871 0.077 76.300 0.000 K18 5.690 0.069 82.625 0.000 K19 4.883 0.082 59.834 0.000 IPC 0.000 0.000 999.000 999.000 MFRQ 0.000 0.000 999.000 999.000 FRIEND 0.000 0.000 999.000 999.000 FAMILY 0.000 0.000 999.000 999.000 PB 0.000 0.000 999.000 999.000 Variances K 0.075 0.026 2.871 0.004 Residual Variances K2 1.390 0.137 10.186 0.000 K3 2.264 0.223 10.143 0.000 K4 1.079 0.173 6.251 0.000 K5 1.964 0.207 9.503 0.000 K7 0.385 0.145 2.661 0.008 K8 1.379 0.179 7.719 0.000 K11 0.838 0.221 3.796 0.000 K12 1.549 0.251 6.178 0.000 K13 1.893 0.191 9.893 0.000 K14 0.571 0.123 4.642 0.000 K15 0.611 0.110 5.577 0.000 K16 1.018 0.111 9.130 0.000 K17 0.421 0.078 5.429 0.000 K18 0.631 0.076 8.332 0.000 K19 2.094 0.196 10.690 0.000 IPC 0.174 0.050 3.471 0.001 MFRQ 0.927 0.158 5.879 0.000 FRIEND 0.581 0.100 5.802 0.000 FAMILY 1.350 0.176 7.663 0.000 PB 0.938 0.207 4.520 0.000 Group MALE IPC BY K2 1.000 0.000 999.000 999.000 K3 1.272 0.220 5.776 0.000 K4 1.770 0.279 6.353 0.000 K5 1.398 0.231 6.052 0.000 MFRQ BY K7 1.000 0.000 999.000 999.000 K8 0.947 0.087 10.883 0.000 FRIEND BY K16 1.000 0.000 999.000 999.000 K17 1.127 0.072 15.712 0.000 K18 0.913 0.062 14.638 0.000 K19 0.638 0.074 8.634 0.000 FAMILY BY K13 1.000 0.000 999.000 999.000 K14 1.234 0.075 16.488 0.000 K15 1.135 0.068 16.713 0.000 PB BY K11 1.000 0.000 999.000 999.000 K12 0.964 0.165 5.828 0.000 K BY IPC 1.000 0.000 999.000 999.000 MFRQ 2.063 0.378 5.458 0.000 FRIEND 1.939 0.354 5.481 0.000 FAMILY 1.584 0.314 5.038 0.000 PB 1.097 0.293 3.737 0.000 Means K -0.004 0.070 -0.059 0.953 Intercepts K2 5.035 0.067 75.317 0.000 K3 4.314 0.085 50.492 0.000 K4 4.368 0.082 53.473 0.000 K5 4.447 0.084 52.866 0.000 K7 5.942 0.081 73.488 0.000 K8 5.565 0.091 61.327 0.000 K11 6.043 0.085 71.165 0.000 K12 5.520 0.105 52.352 0.000 K13 3.935 0.104 37.666 0.000 K14 4.819 0.107 45.129 0.000 K15 4.372 0.100 43.811 0.000 K16 5.729 0.081 71.044 0.000 K17 5.871 0.077 76.300 0.000 K18 5.690 0.069 82.625 0.000 K19 4.883 0.082 59.834 0.000 IPC 0.000 0.000 999.000 999.000 MFRQ -0.548 0.162 -3.394 0.001 FRIEND -0.586 0.142 -4.116 0.000 FAMILY -0.340 0.151 -2.256 0.024 PB -0.813 0.138 -5.888 0.000 Variances K 0.265 0.087 3.041 0.002 Residual Variances K2 1.429 0.161 8.853 0.000 K3 2.374 0.262 9.065 0.000 K4 1.294 0.191 6.756 0.000 K5 2.013 0.229 8.792 0.000 K7 0.574 0.178 3.220 0.001 K8 1.112 0.189 5.889 0.000 K11 1.363 0.302 4.520 0.000 K12 2.166 0.318 6.809 0.000 K13 1.793 0.203 8.838 0.000 K14 0.882 0.156 5.639 0.000 K15 0.713 0.129 5.534 0.000 K16 1.617 0.181 8.934 0.000 K17 0.538 0.105 5.127 0.000 K18 0.763 0.098 7.795 0.000 K19 2.133 0.221 9.653 0.000 IPC 0.174 0.050 3.471 0.001 MFRQ 0.927 0.158 5.879 0.000 FRIEND 0.581 0.100 5.802 0.000 FAMILY 1.350 0.176 7.663 0.000 PB 0.938 0.207 4.520 0.000 Standardized Parameter Estimates Two-Tailed Estimate S.E. Est./S.E. P-Value Group FEMALE IPC BY K2 0.390 0.047 8.218 0.000 K3 0.388 0.048 8.037 0.000 K4 0.648 0.059 10.994 0.000 K5 0.445 0.050 8.832 0.000 MFRQ BY K7 0.874 0.049 17.865 0.000 K8 0.669 0.039 17.005 0.000 FRIEND BY K16 0.677 0.035 19.459 0.000 K17 0.850 0.028 30.661 0.000 K18 0.730 0.031 23.308 0.000 K19 0.379 0.039 9.674 0.000 FAMILY BY K13 0.669 0.032 21.221 0.000 K14 0.897 0.023 39.321 0.000 K15 0.874 0.023 37.885 0.000 PB BY K11 0.742 0.075 9.937 0.000 K12 0.617 0.062 9.939 0.000 K BY IPC 0.548 0.069 7.942 0.000 MFRQ 0.506 0.054 9.355 0.000 FRIEND 0.571 0.066 8.598 0.000 FAMILY 0.349 0.051 6.859 0.000 PB 0.296 0.058 5.071 0.000 Means K 0.000 0.000 999.000 999.000 Intercepts K2 3.932 0.182 21.640 0.000 K3 2.642 0.127 20.859 0.000 K4 3.204 0.141 22.736 0.000 K5 2.841 0.129 21.995 0.000 K7 4.655 0.209 22.302 0.000 K8 3.523 0.154 22.902 0.000 K11 4.425 0.201 22.063 0.000 K12 3.489 0.175 19.944 0.000 K13 2.124 0.096 22.233 0.000 K14 2.824 0.116 24.371 0.000 K15 2.715 0.114 23.920 0.000 K16 4.179 0.164 25.526 0.000 K17 4.770 0.196 24.306 0.000 K18 4.899 0.192 25.564 0.000 K19 3.123 0.135 23.101 0.000 IPC 0.000 0.000 999.000 999.000 MFRQ 0.000 0.000 999.000 999.000 FRIEND 0.000 0.000 999.000 999.000 FAMILY 0.000 0.000 999.000 999.000 PB 0.000 0.000 999.000 999.000 Variances K 1.000 0.000 999.000 999.000 Residual Variances K2 0.848 0.037 22.962 0.000 K3 0.849 0.038 22.614 0.000 K4 0.581 0.076 7.612 0.000 K5 0.802 0.045 17.840 0.000 K7 0.236 0.086 2.760 0.006 K8 0.553 0.053 10.503 0.000 K11 0.449 0.111 4.050 0.000 K12 0.619 0.077 8.067 0.000 K13 0.552 0.042 13.063 0.000 K14 0.196 0.041 4.795 0.000 K15 0.236 0.040 5.839 0.000 K16 0.542 0.047 11.495 0.000 K17 0.278 0.047 5.898 0.000 K18 0.467 0.046 10.228 0.000 K19 0.857 0.030 28.883 0.000 IPC 0.700 0.076 9.247 0.000 MFRQ 0.744 0.055 13.626 0.000 FRIEND 0.674 0.076 8.884 0.000 FAMILY 0.878 0.036 24.688 0.000 PB 0.913 0.035 26.443 0.000 Group MALE IPC BY K2 0.485 0.060 8.071 0.000 K3 0.480 0.057 8.359 0.000 K4 0.718 0.045 16.059 0.000 K5 0.547 0.053 10.299 0.000 MFRQ BY K7 0.884 0.038 23.283 0.000 K8 0.790 0.041 19.396 0.000 FRIEND BY K16 0.703 0.033 21.422 0.000 K17 0.888 0.023 38.446 0.000 K18 0.795 0.029 27.902 0.000 K19 0.481 0.048 9.949 0.000 FAMILY BY K13 0.727 0.030 24.042 0.000 K14 0.881 0.022 40.334 0.000 K15 0.886 0.021 41.897 0.000 PB BY K11 0.693 0.076 9.133 0.000 K12 0.592 0.056 10.476 0.000 K BY IPC 0.777 0.050 15.689 0.000 MFRQ 0.741 0.050 14.859 0.000 FRIEND 0.795 0.039 20.467 0.000 FAMILY 0.574 0.054 10.616 0.000 PB 0.504 0.078 6.430 0.000 Means K -0.008 0.136 -0.059 0.953 Intercepts K2 3.684 0.173 21.314 0.000 K3 2.457 0.122 20.088 0.000 K4 2.674 0.139 19.202 0.000 K5 2.625 0.136 19.270 0.000 K7 3.665 0.176 20.782 0.000 K8 3.238 0.152 21.287 0.000 K11 3.734 0.169 22.152 0.000 K12 3.024 0.146 20.678 0.000 K13 2.017 0.097 20.686 0.000 K14 2.425 0.113 21.531 0.000 K15 2.403 0.113 21.353 0.000 K16 3.206 0.147 21.816 0.000 K17 3.684 0.172 21.439 0.000 K18 3.948 0.178 22.165 0.000 K19 2.931 0.141 20.822 0.000 IPC 0.000 0.000 999.000 999.000 MFRQ -0.382 0.114 -3.369 0.001 FRIEND -0.467 0.114 -4.098 0.000 FAMILY -0.239 0.106 -2.262 0.024 PB -0.725 0.146 -4.967 0.000 Variances K 1.000 0.000 999.000 999.000 Residual Variances K2 0.765 0.058 13.134 0.000 K3 0.770 0.055 13.979 0.000 K4 0.485 0.064 7.553 0.000 K5 0.701 0.058 12.085 0.000 K7 0.219 0.067 3.255 0.001 K8 0.376 0.064 5.854 0.000 K11 0.520 0.105 4.953 0.000 K12 0.650 0.067 9.725 0.000 K13 0.471 0.044 10.696 0.000 K14 0.223 0.039 5.796 0.000 K15 0.215 0.037 5.751 0.000 K16 0.506 0.046 10.987 0.000 K17 0.212 0.041 5.164 0.000 K18 0.367 0.045 8.098 0.000 K19 0.769 0.046 16.541 0.000 IPC 0.396 0.077 5.154 0.000 MFRQ 0.451 0.074 6.107 0.000 FRIEND 0.368 0.062 5.967 0.000 FAMILY 0.670 0.062 10.781 0.000 PB 0.746 0.079 9.460 0.000