Improvement of quality of reporting in randomised controlled trials to prevent hypotension after spinal anaesthesia for caesarean section

Table 2 Proportion of reporting of CONSORT items in randomised controlled trials in periods pre- (1990–1994) and post-CONSORT (2004–2008)

Data items	Combined	Pre-CONSORT	Post-CONSORT	Odds ratio (95% CI)	p value
Title and abstract
Randomised	1.0 (37)	1.0 (13)	1.0 (24)		1.0
Introduction
Scientific background	1.0 (37)	1.0 (13)	1.0 (24)		1.0
Eligibility criteria for participants	1.0 (37)	1.0 (13)	1.0 (24)		1.0
Details of Intervention	1.0 (37)	1.0 (13)	1.0 (24)		1.0
Objectives	1.0 (37)	1.0 (13)	1.0 (24)		1.0
Endpoints	0.89 (33)	0.77 (10)	0.96 (23)	6.9 (0.69; 74.51)	0.115
Sample size	0.54 (20)	0.23 (3)	0.71 (17)	8.1 (1.70; 38.58)	0.007
Methods of randomization	0.70 (26)	0.38 (5)	0.88 (21)	11.2 (2.11; 58.37)	0.003
Allocation concealment	0.57 (21)	0.38 (5)	0.67 (16)	3.2 (1.17; 8.74)	0.096
Implementation of randomization	0.41 (15)	0.08 (1)	0.58 (14)	16.8 (1.87; 150.73)	0.003
Blinding	0.65 (24)	0.31(4)	0.8 (20)	11.25 (2.29; 55.35)	0.0023
Statistical methods	0.89 (33)	0.69 (9)	1.0 (24)		0.011
Results
Participant flow	0.91 (34)	0.77 (10)	1.0 (24)		0.037
Recruitment + follow-up	0.51 (19)	0.61 (8)	0.46 (11)	0.53 (0.13; 2.10)	0.895
Baseline data	0.95 (35)	0.85 (11)	1.0 (24)		0.12
Intention-to-treat analysis	0.92 (34)	0.76 (10)	1.0 (24)		0.037
Outcome and estimation	0.95 (35)	0.85 (11)	1.0 (24)		0.12
Ancillary analysis	0.29 (11)	0.15 (2)	0.38 (9)	3.3 (0.59; 18.40)	0.15
Adverse effects	0.81 (30)	0.92 (12)	0.75 (18)	0.25 (0.03; 2.34)	0.9
Discussion
Interpretation of results	0.95 (35)	0.84 (11)	1.0 (24)		0.12
Generalizability	0.86 (32)	0.69 (9)	0.96 (23)	10.22 (1.00; 104.0)	0.042
Overall evidence	0.95 (35)	0.85 (11)	1.0 (24)		0.12