Table 2.

Demographic characteristics of the population.

	N (%)
Number of cases	30,835
Male [n (%)]	20,752 (67.3)
Rural [n (%)]	6362 (20.6)
Age [median (range)] in years	44 (6–78)
Educational status [n (%)]
Illiterate	946 (3)
Primary education	7123 (23)
Secondary education	14,181 (46)
Tertiary education	8585 (28)
Smoking
Current smoking [n (%)]	1609 (5.2)
Past smoking [n (%)]	443 (1.4)
History of appendectomy	861 (2.8)