Table 2. Parameters and model fitness statistics for multilevel negative binomial regression analysis.

Parameters	Null model	Model 2	Model 3	Model 4
Cluster level variance (SE)	0.036 (0.001)	0.027(0.0008)	0.023 (0.0007)	0.022 (0.0007)
ICC	0.18%
MIRR	1.20 (95% CI = 1.18, 1.21)	1.17(95% CI = 1.16, 1.17)	1.15(95% CI = 1.15, 1.16)	1.15(95% CI = 1.15, 1.16)
PCV	Reff.	33.3%	56.5%	63.6%
Model fitness
Deviance	1,169,652	1,157,281	1,150,418	1,098,785

ICC = intra-class correlation coefficient; MIRR = median incident rate ratio; PCV = proportional change in variance.

Model I is the null model, a baseline model without any independent variable.

Model II is adjusted for individual-level factors.

Model III is adjusted for community-level factors.

Model IV is the full model adjusted for both individual and community-level factors.