Table 6. Skin phenotype, season of blood collection and use of vitamin D supplements in men, according to quartiles of gait speed and of hand grip strength.
| Men (n = 591) | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Gait speed (m/s) | Hand grip strength (Kgf) | |||||||||
| 1st quartile < 0.74 (n = 147) |
2nd quartile [0.74–0.94[ (n = 147) |
3rd quartile [0.94–1.19[ (n = 147) |
4th quartile ≥ 1.19 (n = 150) |
p | 1st quartile < 24.8 (n = 148) |
2nd quartile [24.8–30.4[ (n = 148) |
3rd quartile [30.4–36.9[ (n = 147) |
4th quartile ≥ 36.9 (n = 148) |
p | |
| Skin phenotype 1, n (%) | ||||||||||
| Pale white or white skin, blond or red hair, freckles | 27 (18.4) | 20 (13.6) | 38 (26.0) | 19 (12.7) | 0.072 | 30 (20.3) | 25 (17.0) | 21 (14.3) | 28 (18.9) | 0.742 |
| Cream white skin or moderate brown skin | 112 (76.2) | 117 (79.6) | 101 (69.2) | 121 (80.7) | 109 (73.6) | 116 (78.9) | 115 (78.2) | 111 (75.0) | ||
| Dark brown skin or black people | 8 (5.4) | 10 (6.8) | 7 (4.8) | 10 (6.6) | 9 (6.1) | 6 (4.1) | 11 (7.5) | 9 (6.1) | ||
| Season of blood sample collection 2, n (%) | ||||||||||
| Autumn/ Winter | 71 (48.3) | 59 (40.1) | 40 (27.4) | 34 (22.7) | < 0.001 | 66 (44.9) | 60 (40.5) | 49 (33.3) | 34 (23.0) | < 0.001 |
| Spring/ Summer | 76 (51.7) | 88 (59.9) | 106 (72.6) | 116 (77.3) | 81 (55.1) | 88 (59.5) | 98 (66.7) | 114 (77.0) | ||
| Use of supplements with vitamin D, n (%) | ||||||||||
| No | 128 (87.1) | 130 (88.4) | 139 (94.6) | 147 (98.0) | 0.003 | 127 (85.8) | 130 (87.8) | 141 (95.9) | 146 (98.6) | < 0.001 |
| Yes | 2 (1.4) | 7 (4.8) | 3 (2.0) | 3 (2.0) | 8 (5.4) | 4 (2.7) | 2 (1.4) | 1 (0.7) | ||
| Unknown composition or use | 17 (11.5) | 10 (6.8) | 5 (3.4) | 0 (0.0) | 13 (8.8) | 14 (9.5) | 4 (2.7) | 1 (0.7) | ||
1 Information was not registered for one participant (0.2%).
2 Information was not reported by one participant (0.2%). Values shown in parentheses refer to column percentage number; p values are relative to the differences between quartiles.