Table 3 Regression analysis of individual quality criteria versus year-of-publication of the manuscripts identified by the PubMed MEDLINE search This table lists the results of the regression analyses comparing year-of-publication against the individual quality criteria.
quality criterion | regression result (W = Wald stat) | Cox & Snell R2 | regression line |
|---|---|---|---|
the assessment of the distribution of patient characteristics and prognostic factors between groups | W = 0.96, P = 0.33 | 0.01 | y = -0.075x + 9.45 |
prevention of the movement of patients between groups after allocation, and the use of intention-to-treat analysis | W = 1.63, P = 0.20 | 0.02 | y = 0.088x - 10.30 |
the blinding of the patients to the treatment they received | W = 0.30, P = 0.58 | 0.003 | y = 0.022x - 0.80 |
the blinding of the health care providers to the treatments received by the patients | W = 2.00, P = 0.16 | 0.02 | y = 0.055x - 5.71 |
the blinding of the outcome observer to the treatment received by the patient | W = 0.01, P = 0.93 | 0.000 | y = 0.003x + 0.57 |
adequacy of follow-up | W = 0.03, P = 0.86 | 0.000 | y = -0.006x + 1.18 |
allocation concealment | W = 1.06, P = 0.30 | 0.011 | y = 0.39x - 78.4 |