Family size       Total no (%) of girls      Mean age at              95%  Confidence                     t-statistic
                        who have attained      menarche menarche   Confidence Interval, CI           ( p value)

Small size            221(13.5)               13.09+1.31a                    12.91-13.26                 a vs c: t= 4.82 (<0.01)
Medium size        1063(64.8)             13.41+1.28b                     13.33-13.49                a vs b: t= 3.32 (<0.05)


Large size             356(21.7)                       13.64+1.37c            13.50-13.78                b vs c: t= 2.79 (<0.05)
Total                     1640(100.0)                   13.44+1.32               13.38-13.50
Table 4: Family size and mean age at menarche.