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Table 1 Characteristics of study completers vs non-completers

From: Clinical trials from the patient perspective: survey in an online patient community

  Total (N = 6,815) Completers (N = 1,621) Non-completers (N = 5,194) Test Statistic p-value
N 6,815 1,621 5,194   
Age (years) a     7.7 <0.0001
 Mean ± SD 53 ± 13 55 ± 11 52 ± 13   
 Unknown, N (%) 231 (3%) 0 (0%) 231 (4%)   
Sex, N (%)a     0.0 0.989
 Female 4,390 (65%) 1,078 (67%) 3,312 (64%)   
 Male 2,210 (32%) 543 (33%) 1,667 (32%)   
 Unknown 215 (3%) 0 (0%) 215 (4%)   
Primary Condition, N (%)     283.1 <0.0001
 ALS 833 (12%) 160 (10%) 673 (13%)   
 T2DM 1,249 (18%) 158 (10%) 1091 (21%)   
 Epilepsy 556 (8%) 131 (8%) 425 (8%)   
 Fibromyalgia 665 (10%) 241 (15%) 424 (8%)   
 MS 1,000 (15%) 343 (21%) 657 (13%)   
 MDD 543 (8%) 91 (5%) 452 (9%)   
 PD 998 (15%) 319 (20%) 679 (13%)   
 RA 624 (9%) 125 (8%) 499 (10%)   
 SLE 346 (5%) 53 (3%) 293 (5%)   
  1. SD Standard deviation
  2. a Only available data (excluding unknown) used for statistical comparison between completers and non-completers