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Table 3 Results from "Baby Walker" trial.

From: Spatial effects should be allowed for in primary care and other community-based cluster RCTS

     AIC
Model b(Treat) se AIC Difference
Ignore clustering N/S gradient only -0.660 0.141 1245.57 0.00
Ignore clustering + N/S + E/W -0.651 0.141 1247.09 1.53
Rand Pract + N/S -0.655 0.148 1247.48 1.91
Rand Pract + N/S + E/W -0.646 0.148 1249.03 3.46
Ignore clusteringa -0.618 0.138 1254.50 8.93
Robust se (pract as cluster) -0.618 0.164 1254.50 8.93
Rand Practb -0.629 0.167 1255.29 9.73
Rand Pract + MM -0.609 0.158 1256.92 11.35
  1. LR test for random effect, model (a) vs model (b): chisquared 2(01) = 0.06 P = 0.4017