Table 1

Demographic factors, lifestyle factors, number of long-term conditions and rheumatoid factor status in patients with and without rheumatoid arthritis (RA)

Participants with RA (n=5658)Participants without RA (n=496 882)
Mean age (years (SD)); missing values=0 (0%)59.3 (7.1)56.5 (8.1)
Age (years); missing values=0 (0%)
 37–49675 (11.9%)117 209 (23.6%)
 50–591800 (31.8%)165 359 (33.3%)
 60–733183 (56.3%)214 314 (43.1%)
Sex; missing values=0 (0%)
 Female3952 (69.8%)269 452 (54.2%)
 Male1706 (30.2%)227 430 (45.8%)
Townsend score; missing values=623 (0.12%)
 0–20 (least deprived)998 (17.7%)99 665 (20.1%)
 20–40980 (17.4%)99 117 (20%)
 40–601087 (19.2%)99 311 (20%)
 60–801154 (20.4%)99 224 (20%)
 80–100 (most deprived)1429 (25.3%)98 952 (19.9%)
Smoking status; missing values=2950 (0.59 %)
 Never2625 (46.8%)270 916 (54.8%)
 Current or previous2983 (53.2%)223 066 (45.2%)
Frequency of alcohol intake; missing values=1502 (0.30 %)
 Never or special occasions only1830 (32.4%)96 832 (19.5%)
 One to three times a month690 (12.2%)55 170 (11.1%)
 One to four times a week2315 (41%)242 428 (48.9%)
 Daily or almost daily811 (14.4%)100 962 (20.4%)
BMI (kg/m2); missing values=5820 (1.15%)
 Underweight <18.550 (0.9%)2576 (0.5%)
 Normal weight 18.5–24.91543 (27.9%)155 896 (31.7%)
 Overweight 25–29.92194 (39.6%)212 032 (43.2%)
 Obese ≥301750 (31.6%)120 679 (24.6%)
Physical activity; missing values=7156 (1.42 %)
 None814 (14.8%)32 035 (6.5%)
 Low409 (7.4%)18 531 (3.8%)
 Medium4111 (74.5%)389 412 (79.5%)
 High182 (3.3%)49 890 (10.2%)
Number of long-term conditions; missing values=1845 (0.36 %)
 01369 (24.3%)173 846 (35.1%)
 11690 (30.0%)162 657 (32.9%)
 2–31943 (34.5%)134 403 (27.1%)
 ≥4623 (11.1%)24 157 (4.9%)
Rheumatoid factor (IU/ml); missing values=33 066 (6.6 %)
 <203396 (64.4%)447 472 (96.4%)
 >201879 (35.6%)16 720 (3.6%)
  • Unless otherwise indicated, all results are shown as number (%).

  • Unless indicated, p<0.01. χ2 test was used for categorical variables, Kruskal-Wallis test was used for continuous variables.