Skip to main content

Table 4 ITS study effect sizes reported

From: Methodology and reporting characteristics of studies using interrupted time series design in healthcare

  N = 116
Relative effects
 Relative slope 13 (11)
 Relative to: N = 13
 Baseline trend 8 (62)
 Not stated 5 (38)
 CI/SE reported 1 (8)
p-value reported 2 (15)
 Relative level 16 (14)
 Relative to: N = 16
 Baseline trend 13 (81)
 Last pre-intervention data point 1 (6)
 Not stated 2 (13)
 CI/SE reported 8 (50)
 p-value reported 6 (38)
Absolute effects
 Change in slope 97 (84)
 CI/SE reported 74/97 (76)
 p-value reported 84/97 (87)
 Change in level 81 (70)
 Immediate 75/81 (93)
 CI/SE reported 60/75 (80)
 p-value reported 67/75 (89)
 Other level effects 17/81 (21)
 CI/SE reported 11/17 (65)
 p-value reported 8/17 (47)
Other estimates reported
 Intercept 40 (34)
 Pre-slope trend 74 (64)
 Post-slope trend 15 (13)
  1. Values are n (%). Abbreviations: CI Confidence interval, SE Standard error
\