Summary of index cases (n = 206).

1n = 1 missing;
2n = 81 missing;
3degree of positivity not known for n = 6 (all known to be smear positive);
4of n = 8 scanty, n = 1 had a single smear scanty and culture positive, n = 4 have two scanty smears and n = 3 have three scanty smears;
5n = 23 missing;
6n = 8 missing;
7n = 10 missing;
8n = 134 missing.
IQR =  interquartile range; col = column