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Table 3 Primary analysis of total daily energy purchased

From: Impact of calorie labelling in worksite cafeterias: a stepped wedge randomised controlled pilot trial

Fixed effects Calories
M (SD)
95%CI p Pre-Intervention Mean Daily Calories % Change Post-Intervention 95%CI
(Intercept) 150637.1 (28779.4) (94230.4, 207043.7) < 0.0001    
Site 3 Till Changeb 71573.5 (11394.4) (49240.8, 93906.1) < 0.0001    
Site 3End Outliersb 88118.6 (11036.5) (66487.5, 109749.6) < 0.0001    
Site 3Start Outliersb 75880.6 (12624.4) (51137.2, 100624.0) < 0.0001    
Site 5 Outliersb 90157.4 (10249.5) (70068.7, 110246.1) < 0.0001    
Site 1 Outliersb 94505.4 (14167.9) (66736.9, 122273.9) < 0.0001    
Week day (Ref = Monday)
 Tuesday 7960.1 (3177.8) (1731.8, 14188.4) 0.0150    
 Wednesday 21430.7 (3125.8) (15304.4, 27557.1) < 0.0001    
 Thursday 12899.7 (3148.5) (6728.8, 19070.7) 0.0001    
 Friday − 9580.2 (3807.9) (−17043.5, − 2116.8) 0.0146    
Transactions 70.1 (10.1) (50.3, 89.8) < 0.0001    
Interventiona
 Site1 −24381.2 (11893.4) (−47691.7, − 1070.6) 0.0448 370114.3 −6.6% (−12.9%, −0.3%)
 Site2 1742.0 (10962.2) (−19743.5, 23227.4) 0.8743 150105.7 1.2% (−13.2%, 15.5%)
 Site3 2737.8 (10968.1) (−18759.3, 24234.9) 0.8038 256231.0 1.1% (−7.3%, 9.5%)
 Site4 945.7 (10962.4) (−20540.1, 22431.5) 0.9315 200117.1 0.5% (−10.3%, 11.2%)
 Site5 12407.6 (10962.0) (− 9077.6, 33892.7) 0.2623 131628.9 9.4% (−6.9%, 25.7%)
 Site6 14836.6 (10841.4) (− 6412.1, 36085.3) 0.1763 174700.4 8.5% (−3.7%, 20.7%)
  1. Note. P-values are based on the Kenward-Roger correction to DF. aSite-specific intervention effects were obtained by refitting the model with a different reference category. bDummy variables for outliers