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Table 3 Difference in plate waste, consumption, serving waste, kitchen waste, prepared food, leftover food, and number of lunch consumers between baseline and intervention periods with 95% confidence intervals

From: Sustainable and acceptable school meals through optimization analysis: an intervention study

    School 1School 2School 3
 BaselineInterventionParameter estimates1BaselineInterventionParameter estimates1BaselineInterventionParameter estimates1
UnitMean95% CIMean95% CIβ1Pβ2PMean95% CIMean95% CIβ1Pβ2PMean95% CIMean95% CIβ1Pβ2P
Plate wastekg13.512.0–14.913.711.8–15.7−1.550.7510.140.49617.415.4–19.419.617.6–21.50.950.864−0.060.80411.810.3–13.311.710.3–13.10.380.926−0.060.722
g/pupil23.120.8–25.523.920.0–27.7−4.090.6480.340.37031.527.7–35.434.930.9–38.80.150.9890.030.94839.133.1–45.232.228.4–36.0−0.610.966− 0.010.989
Consumptionkg143126–159154134–17544.90.367−3.30.124187151–224185155–21513.490.882−3.890.3178676–977363–83−0.710.981−0.510.681
g/pupil245218–272264231–29669.130.387−4.990.146337274–401324274–375−1.10.994−5.220.442286239–333201171–237−35.330.7450.710.877
Serving wastekg16.110.5–21.721.013.2–28.74.620.8070.370.65035.825.4–46.134.824.9–44.719.100.504−1.200.3278.76.6–10.812.87.9–17.612.640.233−0.320.471
Kitchen wastekg5.44.1–6.810.07.9–12.016.40< 0.001−0.310.1234.53.5–5.56.04.6–7.54.540.198−0.110.4723.92.9–4.83.02.0–4.0−1.260.6350.050.644
Prepared foodkg195177–214209190–22875.460.134−4.490.039277242–312283252–314−4.100.963−3.310.384115104–125118109–128−2.420.9320.200.87
Leftover foodkg23.415.3–31.520.112.9–27.327.470.190−1.690.06736.427.6–45.144.032.7–55.3−37.640.1811.840.1258.35.2–11.420.825.1–26.5−15.270.2121.100.038
Lunch consumersn582561–603584559–60911.050.864−1.170.671555533–577567545–59038.130.540−2.660.317313285–340368343–3949.030.897−1.430.63
  1. Bold text indicates statistically significant p-values (< 0.05).
  2. 1Parameter estimates for linear regression model with period (baseline and intervention) and interaction term time*period as independent effects, adjusted for time
  3. β1, Beta coefficient for the mean difference (baseline vs. intervention), with baseline period as the reference category
  4. β2, Beta coefficient for the slope difference (baseline vs. intervention), with baseline period as the reference category