Skip to main content

Table 4 Presentation of results in the Results section and abstract for studies reporting adjusted analysis

From: Reporting on covariate adjustment in randomised controlled trials before and after revision of the 2001 CONSORT statement: a literature review

Year of Publication Results Section Abstract
  2000
(n = 54)
2006
(n = 89)
P-value 2000
(n = 71)*
2006
(n = 101)
P-value
Summary statistics for each group    0.7    0.5
   Unadjusted only 42 (78%) 70 (80%)   26 (37%) 45 (44%)  
   Adjusted only 6 (11%) 12 (14%)   3 (4%) 5 (5%)  
   Both 4 (7%) 3 (3%)   0 0  
   None/not clear 2 (4%) 3 (3%)   42 (59%) 51 (51%)  
Confidence interval/SE within group    0.2    1.0
   Unadjusted only 12 (22%) 11 (13%)   2 (3%) 2 (2%)  
   Adjusted only 6 (11%) 10 (11%)   2 (3%) 4 (4%)  
   Both 1 (2%) 0   0 (%) 0  
   None/not clear 35 (65%) 67 (76%)   67 (94%) 95 (94%)  
Treatment effect    0.4    0.1
   Unadjusted only 5 (9%) 5 (6%)   3 (4%) 5 (5%)  
   Adjusted only 17 (31%) 35 (39%)   5 (7%) 19 (19%)  
   Both 4 (7%) 12 (13%)   1 (2%) 1 (1%)  
   None/not clear 28 (52%) 37 (42%)   62 (87%) 76 (75%)  
Confidence interval/SE of treatment effect    0.6    0.4
   Unadjusted only 6 (11%) 5 (6%)   2 (3%) 6 (6%)  
   Adjusted only 16 (30%) 24 (27%)   3 (4%) 17 (17%)  
   Both 4 (7%) 10 (11%)   1 (2%) 1 (1%)  
   None/not clear 28 (52%) 49 (56%)   65 (91%) 77 (76%)  
P-value for treatment effect    0.2    0.2
   Unadjusted only 9 (17%) 8 (9%)   9 (13%) 13 (13%)  
   Adjusted only 27 (50%) 52 (59%)   13 (18%) 30 (30%)  
   Both 7 (13%) 17 (19%)   0 2 (2%)  
   None/not clear 11 (20%) 11 (13%)   49 (69%) 56 (55%)  
  1. *13 studies did not report the selected outcome in abstract
  2. 2 studies did not have abstract and 10 studies did not report the selected outcome in the abstract