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Table 4 Reporting of each quality item and supplementary item by structure format, presented with unadjusted and adjusted odds ratios (ORs)

From: Structure formats of randomised controlled trial abstracts: a cross-sectional analysis of their current usage and association with methodology reporting

Items/Supplementary items N (%) Crude OR
(95% CI)
Adjusted OR
(95% CI); P valuea
Overall
(n = 341)
IMRaD
(n = 176)
HS
(n = 165)
1. Design 120 (35.2) 54 (30.7) 66 (40.0) 1.51 (0.96, 2.36) 1.51 (0.77, 2.93); 0.228
2. Participant 327 (95.9) 166 (94.3) 161 (97.6) 2.43 (0.75, 7.89) 2.43 (0.80, 7.33); 0.116
3. Setting 182 (53.4) 65 (36.9) 117 (70.9) 4.16 (2.64, 6.56) 4.16 (1.74, 9.97); 0.001
4. Interventions 268 (78.6) 138 (78.4) 130 (78.8) 1.02 (0.61, 1.72) 1.02 (0.64, 1.62); 0.924
5. Outcome 177 (51.9) 72 (40.9) 105 (63.6) 2.53 (1.63, 3.91) 2.53 (1.30, 4.92); 0.006
5a. Time point 138 (40.5) 49 (27.8) 89 (53.9) 3.04 (1.94, 4.76) 3.04 (1.49, 6.19); 0.002
5b. No. of outcomes b 123 (36.1)c 93 (52.8)c 30 (18.2)c 1.87 (0.88, 3.97)f 1.83 (0.69, 4.87); 0.224
  177 (51.9)d 72 (40.9)d 105 (63.6)d   
  41 (12.0)e 11 (6.3)e 30 (18.2)e   
6. Random assignment 336 (98.5) 172 (97.7) 164 (99.4) 3.81 (0.42, 34.48) 3.81 (0.47, 30.76); 0.209
6a. Unit of randomisation 246 (72.1) 141 (80.1) 105 (63.6) 0.43 (0.27, 0.71) 0.43 (0.25, 0.77); 0.004
7. Sequence generation 16 (4.7) 11 (6.3) 5 (3.0) 0.47 (0.16, 1.38) 0.47 (0.10, 2.25); 0.343
8. Allocation concealment 7 (2.1) 5 (2.8) 2 (1.2) 0.42 (0.08, 2.19) 0.42 (0.06, 2.76); 0.366
9. Blinding (Masking) 72 (21.1) 38 (21.6) 34 (20.6) 0.94 (0.56, 1.59) 0.94 (0.42, 2.14); 0.887
9a. Generic blinding 57 (16.7) 28 (15.9) 29 (17.6) 1.13 (0.64, 1.99) 1.13 (0.51, 2.47); 0.765
  1. IMRaD Introduction, methods, results, and discussion format, HS Highly structured format
  2. aDerived from GEE analyses adjusting for potential clustering effect among abstracts published in the same journal, with individual quality item as the dependent variable (adequately reported vs. not adequately reported) and journal as the grouping factor;
  3. bA continuous variable, not dichotomous;
  4. cN (%) for category No. = 0; dN (%) for category 1 ≤ No. ≤ 2; eN (%) for category No. > 2;
  5. fDerived from binary logistic regression (reference group: IMRaD format; dependent variable coding: [0] 1 ≤ No. ≤ 2, [1] No. > 2)