Table 1.
Characteristics of the MRC National Survey of Health and Development Stratified by Sex (Sample Restricted to Those With Complete Hip Shape Mode Data and Covariates)
| Women (n = 740) | Men (n = 683) | ||||
|---|---|---|---|---|---|
| Variable | Mean | SD | Mean | SD | Sex difference P value |
| Walking age (months) | 13.6 | 2.3 | 13.7 | 2.3 | 0.40 |
| Birthweight (kg) | 3.39 | 0.62 | 3.45 | 0.57 | 0.06 |
| n | % | n | % | ||
| Father's occupational class (age 4 years) | |||||
| I | 55 | 7.4 | 60 | 8.8 | 0.74 |
| II | 172 | 23.2 | 151 | 22.1 | |
| IIINM | 142 | 19.2 | 134 | 19.6 | |
| IIIM | 204 | 27.6 | 197 | 28.8 | |
| IV | 131 | 17.7 | 104 | 15.2 | |
| V | 36 | 4.9 | 37 | 5.4 | |
| Own occupational class (age 53 years) | |||||
| I | 16 | 2.2 | 93 | 13.6 | <0.01 |
| II | 313 | 42.3 | 326 | 47.7 | |
| IIINM | 265 | 35.8 | 76 | 11.1 | |
| IIIM | 44 | 5.9 | 141 | 20.6 | |
| IV | 77 | 10.4 | 39 | 5.7 | |
| V | 25 | 3.4 | 8 | 1.2 | |
| Musculoskeletal assessments at 60 to 64 years | |||||
|---|---|---|---|---|---|
| Mean | SD | Mean | SD | ||
| Age at time of assessment (years) | 63.2 | 1.1 | 63.2 | 1.2 | 0.13 |
| Height (m) | 1.62 | 0.06 | 1.75 | 0.06 | <0.01 |
| Weight (kg) | 72.1 | 13.6 | 84.9 | 12.8 | <0.01 |
| Appendicular lean mass (kg) | 16.2 | 2.5 | 24.6 | 3.4 | <0.01 |
| Appendicular fat mass (kg) | 14.5 | 4.5 | 10 | 2.9 | <0.01 |
| Hip shape mode (HM) scores (and % of total variance) | |||||
| HM1 (23.0%) | −0.19 | 0.97 | 0.19 | 1 | <0.01 |
| HM2 (18.0%) | −0.19 | 0.96 | 0.19 | 1.02 | <0.01 |
| HM3 (11.9%) | 0.21 | 0.92 | −0.25 | 1 | <0.01 |
| HM4 (5.5%) | −0.2 | 0.9 | 0.22 | 1.06 | <0.01 |
| HM5 (5.4%) | −0.03 | 0.97 | 0.02 | 1.05 | 0.30 |
| HM6 (5.3%) | −0.18 | 1 | 0.21 | 0.96 | <0.01 |
| HM7 (4.1%) | −0.03 | 1.01 | 0 | 0.96 | 0.54 |
| HM8 (3.2%) | −0.15 | 0.97 | 0.13 | 1 | <0.01 |
| HM9 (2.3%) | 0.13 | 0.98 | −0.14 | 1 | <0.01 |
| HM10 (2.0%) | 0.31 | 0.95 | −0.36 | 0.93 | <0.01 |