बांथोरफो गिदिंफिनाय ( ) नायसंनायखौ नायबिजिरथिफोरनि confounderफोर आरो भुमखौराङारि थुबुरखौ ( clustering ) हिसाबखालामनो बानसननाय जादोंमोन ।
Multilevel regression analysis was undertaken to account for confounders and geographical clustering of observations .