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Table 2 District-level suicide rates stratified by population density; relative rates estimated using negative binomial models, adjusted models control for district level unemployment rates

From: Regional variation in suicide rates in Sri Lanka between 1955 and 2011: a spatial and temporal analysis

Population density (population per Sq. mile)a Suicide rate (per 100,000) Relative suicide rate (95% confidence intervals)
  1955 1972 1980 2011 1955* 1972 1980 2011
      Unadjusted Unadjusted Adjustedb Unadjusted Adjustedb Unadjusted Adjustedb
>2000 6.7 13.3 11.9 11.4 1.0 1.0 1.0 1.0 1.0 1.0 1.0
500–2000 7 22.8 30.4 19.3 1.1 (0.5, 2.1) 1.7 (0.8, 3.5) 1.0 (0.5, 1.7) 2.5 (1.3, 4.7) 2.0 (1.1, 3.4) 1.7 (1.3, 2.3) 1.9 (1.4, 2.5)
<500 7.2 23.9 40.2 22.8 1.1 (0.5, 2.4) 1.9 (0.9, 4.1) 0.7 (0.4, 1.4) 3.7 (2.0, 6.9) 2.2 (1.2, 4.1) 1.9 (1.4, 2.5) 2.1 (1.6, 2.7)
  1. acategorised according to 1981 population density; b Adjusted for unemployment; * district level data for unemployment were unavailable in 1955 so adjusted analysis was not possible