 Lower River had the highest infant mortality rate of 96 for every thousand births and under-five mortality of 137 per every thousand births.The poverty gap ratio was maximum in Central River with 36.45 per cent as of 2003 and lowest in Lower River with 19.80 per cent.The literacy rate was maximum in Western with 69.7 per cent compared to a national average of 62.9 per cent, while the lowest was in Upper River with 39 per cent as of 2007.