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Table 5 AQI growth model for all classrooms, and stratified by centre type; with intraclass correlations on age group and classroom levels

From: How stable is program quality in child care centre classrooms?

  Commercial single Commercial single Commercial multi Non-profit single Non-profit multi Municipal
AQI AQI AQI AQI AQI AQI
Fixed effects
 Slope 0.041*** 0.026 0.083*** 0.050*** 0.027** 0.039*
(0.007) (0.023) (0.019) (0.012) (0.010) (0.019)
 Intercept 4.052*** 3.982*** 4.083*** 3.975*** 4.063*** 4.375***
(0.015) (0.041) (0.048) (0.027) (0.023) (0.029)
Random effects
 var(Age group—Intercept) 0.073*** 0.045*** 0.072 0.068*** 0.071*** 0.014***
(0.006) (0.012) (.) (0.010) (0.009) (0.006)
 var(Classroom—Slope) 0.008*** 0.008*** 0.000 0.013*** 0.007*** 0.005***
(0.003) (0.008) (.) (0.005) (0.004) (0.005)
 Intercept 0.010*** 0.004** 0.000 0.026*** 0.005*** 0.000
(0.005) (0.008) (.) (0.010) (0.008) (0.009)
 Cov(Slope|Intercept) − 0.008* − 0.005 0.000 − 0.019 − 0.005 − 0.001
(0.003) (0.008) (.) (0.006) (0.005) (0.006)
var(Residual) 0.077*** 0.074*** 0.067 0.084*** 0.077*** 0.037***
(0.003) (0.009) (.) (0.005) (0.005) (0.007)
N 3057 264 282 1074 1242 195
Level ICC ICC ICC ICC ICC ICC
Age group 0.457 0.363 0.518 0.382 0.465 0.275
Age group|Classroom 0.518 0.393 0.518 0.528 0.498 0.279
  1. Standard errors in parentheses
  2. *p < 0.05, **p < 0.01, ***p < 0.001