Characteristics of study participants at baseline
| Characteristic | N=57* |
| Gender | |
| Man | 23 (40%) |
| Woman | 34 (60%) |
| Ethnicity (cleaned) | |
| Non white/non British | 1 (1.8%) |
| Other/not answered | 4 (7.0%) |
| White/British | 52 (91%) |
| Do you consume any alcohol? | |
| No | 26 (46%) |
| Yes | 30 (54%) |
| Unknown | * |
| Alcohol units/week (excl. non-drinkers) | 9 (3, 14) |
| Non-drinker/unknown | 27 |
| Do you consume any coffee? | |
| No | 16 (28%) |
| Yes | 41 (72%) |
| Cups of coffee/week (excl. non-drinkers) | 12 (7, 20) |
| Non-drinker/unknown | 16 |
| Smoking status | |
| Current | 2 (3.5%) |
| Former | 24 (42%) |
| Never | 31 (54%) |
| Employment status | |
| Employed | 11 (19%) |
| Other | 2 (3.5%) |
| Retired | 44 (77%) |
| Marital status | |
| Divorced | 9 (16%) |
| Married/partner | 36 (63%) |
| Single | 2 (3.5%) |
| Widowed | 10 (18%) |
| Other conditions | |
| No | 18 (34%) |
| Yes (please state) | 35 (66%) |
| Unknown | 4 |
| Other condition(s): other joint replacement | |
| Yes | 4 (100%) |
| Unknown | 53 |
| Other condition(s): pain in other joints | |
| Yes | 4 (100%) |
| Unknown | 53 |
| Other condition(s): arthritis (any) | |
| Yes | 29 (100%) |
| Unknown | 28 |
| Other condition(s): injury | |
| Yes | 3 (100%) |
| Unknown | 54 |
*n (%).