highly significantP > 0.00
This should rule out one possible source of bias between the 2 groups. There was a highly significant (P > 0.00 1) higher frequency of replies to the first questionnaire from the patients than from TABLE IV.- Relative Sister Daughter Maternal aunt Paternal aunt -Total and mean number of relatives Patient Control A , . - Total Mean Total Mean 2657 2-01 2824 9-13 1116 0-84 1331 100 2649 2-11 2748 2-17 2352 2-02 2397 2-00 Dead 23 8 4 No answer: 35 101 14 73 H. 0.