Table 3. Skin phenotype, season of blood collection and use of vitamin D supplements in women, according to quartiles of gait speed and of hand grip strength.
| Women (n = 834) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Gait speed (m/s) | Hand grip strength (Kgf) | |||||||||
| 1st quartile < 0.60 (n = 207) |
2nd quartile [0.60–0.81[ (n = 210) |
3rd quartile [0.81–1.04[ (n = 205) |
4th quartile ≥ 1.04 (n = 212) |
p | 1st quartile < 14.6 (n = 207) |
2nd quartile [14.6–17.7[ (n = 208) |
3rd quartile [17.7–21.8[ (n = 211) |
4th quartile ≥ 21.8 (n = 208) |
p | |
| Skin phenotype 1, n (%) | ||||||||||
| Pale white or white skin, blond or red hair, freckles | 57 (27.5) | 42 (20.2) | 44 (21.5) | 50 (23.6) | 0.336 | 55 (26.6) | 49 (23.7) | 51 (24.2) | 38 (18.4) | 0.127 |
| Cream white skin or moderate brown skin | 139 (67.2) | 151 (72.6) | 153 (74.6) | 154 (72.6) | 144 (69.5) | 142 (68.6) | 154 (73.0) | 157 (75.8) | ||
| Dark brown skin or black people | 11 (a5.3) | 15 (7.2) | 8 (3.9) | 8 (3.8) | 8 (3.9) | 16 (7.7) | 6 (2.8) | 12 (5.8) | ||
| Season of blood sample collection, n (%) | ||||||||||
| Autumn/ Winter | 167 (80.7) | 145 (69.0) | 120 (58.5) | 107 (50.5) | < 0.001 | 144 (69.6) | 143 (68.8) | 139 (65.9) | 113 (54.3) | 0.004 |
| Spring/ Summer | 40 (19.3) | 65 (31.0) | 85 (41.5) | 105 (49.5) | 63 (30.4) | 65 (31.2) | 72 (34.1) | 95 (45.7) | ||
| Use of supplements with vitamin D, n (%) | ||||||||||
| No | 162 (78.3) | 179 (85.3) | 170 (82.9) | 190 (89.6) | < 0.001 | 169 (81.6) | 166 (79.8) | 184 (87.2) | 182 (87.5) | < 0.001 |
| Yes | 14 (6.8) | 15 (7.1) | 17 (8.3) | 19 (9.0) | 9 (4.3) | 19 (9.1) | 16 (7.6) | 21 (10.1) | ||
| Unknown composition or use | 31 (14.9) | 16 (7.6) | 18 (8.8) | 3 (1.4) | 29 (14.1) | 23 (11.1) | 11 (5.2) | 5 (2.4) | ||
1Information was not registered for two participants (0.2%). Values shown in parentheses refer to column percentage number; p values are relative to the differences between quartiles.