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Table 1 Demographic and clinical characteristics of the study population

From: Participants’ awareness of ethical compliance, safety and protection during participation in pharmaceutical industry clinical trials: a controlled survey

Characteristic Study population T2DM COPD   RA   HT  
Cases Controls Cases Controls Cases Controls Cases Controls Cases Controls
n = 604 n = 604 n = 151 n = 151 n = 151 n = 151 n = 151 n = 151 n = 151 n = 151
Age, mean ± SD (years) 54.9 ± 13.9 47.1 ± 15.5a 52.2 ± 12.8 46.6 ± 15.7a 60.3 ± 14.2 53.1 ± 16.7a 50.1 ± 13.4 41.6 ± 15.3a 56.8 ± 13.1 47 ± 12.1a
Age group, n (%)
  < 50 years 216 (35.8) 320 (53.0)a 68 (45.0) 83 (55.0) 31 (20.5) 57 (37.7)a 71 (47.0) 103 (68.2)a 46 (30.5) 77 (51.0)a
  > 50 years 388 (64.2) 284 (47.0) 83 (55.0) 68 (45.0) 120 (79.5) 94 (62.3) 80 (53.0) 48 (31.8) 105 (69.5) 74 (49.0)
Sex, n (%)
 Female 377 (62.4) 394 (65.2) 101 (66.9) 95 (62.9) 69 (45.7) 92 (60.9)b 126 (83.4) 110 (72.8)b 81 (53.6) 97 (64.2)
 Male 227 (37.6) 210 (34.8) 50 (33.1) 56 (37.1) 82 (54.3) 59 (39.1) 25 (16.6) 41 (27.2) 70 (46.4) 54 (35.8)
Years of education, n (%)
  < 9 years 363 (60.1) 341 (56.5) 90 (59.6) 82 (54.3) 89 (58.9) 76 (50.3) 90 (59.6) 85 (56.3) 94 (62.3) 98 (64.9)
  > 9 years 241 (39.9) 263 (43.5) 61 (40.4) 69 (45.7) 62 (41.1) 75 (49.7) 61 (40.4) 66 (43.7) 57 (37.7) 53 (35.1)
Health care, n (%)
 Yes 476 (78.8) 453 (75) 122 (80.8) 118 (78.1) 116 (76.8) 121 (80.1) 112 (74.2) 116 (76.8) 126 (83.4) 98 (64.9)a
 No 128 (21.2) 151 (25) 29 (19.2) 33 (21.9) 35 (23.2) 30 (19.9) 39 (25.8) 35 (23.2) 25 (16.6) 53 (35.1)
Previous clinical trial participation (case group only), n (%)
 One 395 (65.4)   89 (58.9)   89 (58.9)   119 (78.8)   98 (64.9)  
 Two to three 196 (32.5)   60 (39.7)   56 (37.1)   28 (18.5)   52 (34.4)  
Three to six 10 (1.7)   2 (1.3)   5 (3.3)   2 (1.3)   1 (0.7)  
 More than six 3 (0.5)   0 (0)   1 (0.7)   2 (1.3)   0 (0)  
  1. aP ≤ 0.001; bP ≤ 0.05
  2. T2DM Type 2 diabetes mellitus, COPD chronic obstructive pulmonary disease, RA rheumatoid arthritis, HT hypertension