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Table 2 Interrupted time series study design—15-month observation period

From: Using segmented regression analysis of interrupted time series data to assess colonoscopy quality outcomes of a web-enhanced implementation toolkit to support evidence-based practices for bowel preparation: a study protocol

Segments Baseline Comparative-effectiveness Replication
Group 1 O1 O10 X1 O11 O20 X1X2 O21 O30
Group 2 O1 O10 X1X2 O11 O30
  1. Note: Each observation represents a 2-week interval. X1 = physician education, X2 = physician education plus staff training and support