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Life table summary measure for first birth intervals for Bangladesh (BDHS 2004, 2007, 2011)
| Summary measures | BDHS 2004 | BDHS 2007 | BDHS 2011 |
|---|---|---|---|
| B 20 | 0.34 | 0.37 | 0.40 |
| B 40 | 0.68 | 0.71 | 0.78 |
| B 60 | 0.84 | 0.85 | 0.89 |
| Trimean (T) | 16.25 | 16.50 | 17.75 |
| Spread (S) | 20 | 21 | 26 |
| Median (q 2 ) | 20 | 21 | 22 |
