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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