Characteristics of the study women and frequencies of term and preterm live births in 5-calendar year periods from 1990 to 2014 in Matlab, Bangladesh
| Characteristics | Time period | |||||
| 1990–1994 | 1995–1999 | 2000–2004 | 2005–2009 | 2010–2014 | Total | |
| Women’s age at delivery (years) | n (%) | n (%) | n (%) | n (%) | n (%) | n (%) |
| <20 | 2118 (16) | 1996 (16) | 2361 (18) | 2381 (20) | 2640 (22) | 11 496 (18) |
| 20–24 | 4683(36) | 4080 (32) | 4036 (30) | 3927 (32) | 3879 (33) | 20 605 (33) |
| 25–29 | 3732 (28) | 3654 (28) | 3446 (26) | 2993 (25) | 2839 (24) | 16 664 (26) |
| 30–34 | 1781 (14) | 2266 (18) | 2401 (18) | 1801 (15) | 1616 (14) | 9865 (16) |
| ≥35 | 771(6) | 802 (6) | 1127 (8) | 964 (8) | 769 (7) | 4433 (7) |
| Parity | ||||||
| 0 | 3840 (29) | 3980 (31) | 4550 (34) | 4516 (37) | 4960 (42) | 21 846 (35) |
| 1 | 2952 (23) | 3222 (25) | 3556 (27) | 3613 (30) | 3682 (31) | 17 025 (27) |
| 2 | 2285 (17) | 2424 (19) | 2565 (19) | 2214 (18) | 2029 (17) | 11 517 (18) |
| ≥3 | 4008 (31) | 3172 (25) | 2700 (20) | 1723 (14) | 1072 (9) | 12 675 (20) |
| Women’s education (years) | ||||||
| 0 | 5999 (46) | 4186 (33) | 2771 (21) | 1581 (13) | 574 (5) | 15 111 (24) |
| 1–5 | 3408 (26) | 3227 (25) | 2681 (20) | 2856 (24) | 2293 (19) | 14 465 (23) |
| ≥6 | 3678 (28) | 5385 (42) | 7919 (59) | 7629 (63) | 8876 (76) | 33 487 (53) |
| Live births | ||||||
| Term (GW≥37) | 9244 (70.6) | 9601 (75) | 10 630 (79.5) | 10 253 (85) | 10 449 (89) | 50 177 (79.6) |
| Late preterm (GW 34–36) | 2812 (21.5) | 2316 (18.1) | 1963 (14.7) | 1311 (10.9) | 993 (8.5) | 9395 (14.9) |
| Moderate preterm (GW 32–33) | 763 (5.8) | 546 (4.3) | 444 (3.3) | 294 (2.4) | 193 (1.6) | 2240 (3.6) |
| Very preterm (GW<32) | 266 (2.0) | 335 (2.6) | 334 (2.5) | 208 (1.7) | 108 (0.9) | 1251(2) |
| Total preterm (GW<37) | 3841 (29) | 3197 (25) | 2741 (20) | 1813 (15) | 1294 (11) | 12 886 (20) |
GW, gestational week.