Fig. 1

Prevalence of CSA by site. 95 % confidence intervals: Bengaluru 17.6–24.6 %, Belgaum 10.6–16.0 %, Bhopal 9.9–15.5 %, Chennai 29.7–38.9 %, Coimbatore 65.7–74.6 %, New Delhi 6.2–11.4 %, Hyderabad 24.1–31.6 %, Lucknow 13.0–19.0 %, Madurai 30.0–39.5 %, Mangalore 27.9–38.4 %, Vijayawada 10.5–16.3 %, Visakhapatnam 12.5–22.4 %.