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Table 4 Regression analysis of individual quality criteria versus year-of-publication of the manuscripts identified by the CIG Trials Registry This table lists the results of the regression analyses comparing year-of-publication against the individual quality criteria.

From: Effects of the search technique on the measurement of the change in quality of randomized controlled trials over time in the field of brain injury

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 = 5.53, P = 0.02 0.03 y = 0.072x - 4.71
prevention of the movement of patients between groups after allocation, and the use of intention-to-treat analysis W = 4.74, P = 0.03 0.03 y = 0.054x - 13.25
the blinding of the patients to the treatment they received W = 0.04, P = 0.84 0.000 y = 0.006x + 0.77
the blinding of the health care providers to the treatments received by the patients W = 0.16, P = 0.69 0.001 y = -0.010x + 0.32
the blinding of the outcome observer to the treatment received by the patient W = 0.27, P = 0.60 0.002 y = 0.012x - 0.57
adequacy of follow-up W = 3.25, P = 0.07 0.02 y = 0.043x - 3.25
allocation concealment W = 0.23, P = 0.88 0.000 Y = 0.004x - 7.64