Table 2.

Prevalence of gallbladder diseases and gallstones among symptomatic and asymptomatic persons by districts and gender

District	Number USG tested	Symptom/gender	Total gallbladder diseases (%)	95% CI	Gallstones (%)	95% CI
	2078	Symptomatic male	5.08a	2.58–7.58	2.25a	1.37–3.14
	547	Asymptomatic male	2.06	1.00–3.11	0.99	0.60–1.38
	3022	Symptomatic female	8.51a	4.79–12.23	6.41a	3.79–9.04
	901	Asymptomatic female	3.56	1.95–5.17	2.87	1.65–4.11
	5100	Symptomatic persons (all)	7.12a	2.46–11.76	4.72a	0.19–9.24
	1448	Asymptomatic persons (all)	2.99	0.97–5.01	2.31	0.13–4.49
Patna	1086	Male	3.25	1.43–5.07	1.78	0.85–2.72
	1309	Female	5.53a	2.45–8.63	5.33a	2.58–8.09
	2395	Total	4.50	1.08–7.93	3.73	0.00–7.80
Varanasi	537	Male	4.22	1.97–6.47	1.46	0.72–2.18
	1345	Female	6.98a	2.99–10.96	4.29a	1.98–6.59
	1882	Total	6.19	1.86–10.52	3.48	0.28–6.68
Vaishali	1002	Male	5.85	2.89–8.81	2.49	1.30–3.68
	1269	Female	9.69a	4.66–14.72	7.27a	3.73–1.81
	2271	Total	7.99	2.34–13.64	5.15	0.00–10.57
All Districts	2625	Males	4.45	1.13–7.76	1.99	0.69–3.28
	3923	Females	7.37a	2.08–12.66	5.59a	1.82–9.37
	6548	Total	6.20	0.81–11.59	4.15	0.00–8.76

Note: Estimates were based on logistic analysis carried out separately for gallbladder diseases and gallstones. Explanatory variables in these analyses were gender, symptoms (presence or absence) and district.

^aDifferences between male and female prevalence were significant at a 5% level of significance (P < 0.05) in three districts and also among symptomatic and asymptomatic persons.