Group Lowincome Middleincome Highincome Number Percent Number Percent Number Percent GroupI 2 4.4 12 26.7 31 68.9 GroupII 0 0 5 11.6 38 88.4 GroupIII 1 2.2 2 4.3 43 93.5

Table 4: Percentage distribution of subjects on the basis of monthly family income.