Demographic and clinical characteristics of patients with AS (N=265)
| Variable | n (%) |
| Sex | |
| Male | 200 (75.5) |
| Female | 65 (24.5) |
| Age category, years | |
| 20–29 | 38 (14.3) |
| 30–39 | 59 (22.3) |
| 40–49 | 54 (20.4) |
| 50–59 | 70 (26.4) |
| ≥60 | 44 (16.6) |
| Body mass index category | |
| Normal | 101 (38.3) |
| Underweight | 10 (3.8) |
| Overweight | 70 (26.5) |
| Obese | 83 (31.4) |
| Educational level | |
| Junior high school or below | 51 (19.2) |
| Senior high school | 83 (31.3) |
| College, university and above | 131 (49.4) |
| Marital status | |
| Never married | 78 (29.4) |
| Being married | 166 (62.6) |
| Divorced or widowed | 21 (7.9) |
| Occupation type | |
| Seated work | 50 (19.1) |
| Seated and standing work | 94 (35.9) |
| Standing and walking work | 25 (9.5) |
| Walking and strenuous work | 53 (20.2) |
| Not working | 40 (15.3) |
| Perceived health status | |
| Very good or good | 80 (30.2) |
| Fair | 133 (50.2) |
| Poor or very poor | 52 (19.6) |
| Smoking in the past month | |
| No | 187 (70.6) |
| Occasionally | 20 (7.5) |
| Almost daily | 58 (21.9) |
| Alcohol use | |
| No | 157 (59.2) |
| Yes | 108 (40.8) |
| Vegetarian diet | |
| No | 159 (60.0) |
| Occasionally | 92 (34.7) |
| Yes | 14 (5.3) |
| Exercise | |
| No | 102 (40.2) |
| Yes | 152 (59.8) |
| Mean duration of sleep (SD) (median, min–max), hours | 6.8 (1.4) (7, 0–12) |
| Mean duration of AS (SD) (median, min–max), years | 12.9 (10.3) (10, 0.3–50) |
| Mean fatigue score (SD) (median, min–max) | 4.7 (2.2) (5, 0–10) |
| Mean back pain severity score (SD) (median, min–max) | 4.2 (2.4) (4, 0–10) |
| Mean patient global assessment of disease activity score (SD) (median, min–max) | 3.8 (2.5) (4, 0–10) |
| Mean CRP (SD) (median, min–max), mg/L | 7.42 (13.20) (2.40, 2.0–114.0) |
| Mean mSASSS (SD) (median, min–max) | 12.8 (11.1) (9, 0–36) |
| Mean ASDAS-CRP (SD) (median, min–max) | 2.20 (0.83) (2.15, 0.64–4.75) |
| Mean EASi-QoL (SD) (median, min–max) | |
| Physical function | 3.7 (4.0) (2.0, 0–22) |
| Disease activity | 5.0 (3.0) (5.0, 0–15) |
| Emotional well-being | 4.8 (4.1) (4.0, 0–19) |
| Social participation | 4.8 (4.0) (4.0, 0–19) |
Missing values: 1 in body mass index, 3 in occupation type, 11 in exercise, 1 in duration of AS and 5 in mSASSS.
AS, ankylosing spondylitis; ASDAS, Ankylosing Spondylitis Disease Activity Score; CRP, C reactive protein; EASi-QoL, Evaluation of Ankylosing Spondylitis Quality of Life; max, maximum; min, minimum; mSASSS, modified Stoke Ankylosing Spondylitis Spinal Score.