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Table 2 Mean (SD) primary outcome at 6 months and 12 months according to group and ANCOVA results before and after adjusting for season

From: Effectiveness and cost-effectiveness of a loyalty scheme for physical activity behaviour change maintenance: results from a cluster randomised controlled trial

Outcome Intervention Groupa Control Groupa Analysis of covarianceb Analysis of covariancec
N Mean (SD) N Mean (SD) b (95% CI) p-value b (95% CI) p-value
Six month: pedometer steps (steps/day) 249 6990 (3078) 236 7576 (3345) − 519 (− 931, − 107) 0·01 − 336 (− 612, −60) 0·02
12 month: pedometer steps (steps/day) 210 7790 (3462) 180 8203 (3401) − 561 (− 1243, 120) 0·11 −570 (− 1267, 127) 0·11
  1. aMonth six or month 12 outcomes (unadjusted)
  2. bANCOVA comparison of 6 month/12 month means in Intervention vs Control Group adjusted for baseline values of the outcome, and randomisation stratum and corrected for clustering
  3. cANCOVA comparison of 6 month/12 month means in Intervention vs Control Group adjusted for baseline values of the outcome, randomisation stratum and season and corrected for clustering
  4. ANCOVA Analysis of covariance, CI confidence interval, SD standard deviation