From: Trends of preterm birth and low birth weight in Japan: a one hospital-based study
1997-2000 | 2001-2003 | 2004-2006 | 2007-2010 | p value* | |
---|---|---|---|---|---|
All births | |||||
Apgar score 1, mean (SD) | 7.8 (1.4) | 7.9 (1.3) | 8 (1.2) | 8 (1.2) | <0.01 |
Apgar score 5, mean (SD) | 8.6 (0.9) | 8.7 (0.9) | 8.8 (0.8) | 8.8 (0.7) | <0.01 |
Umbilical artery pH, mean (SD) | 7.30 (0.07) | 7.31 (0.07) | 7.30 (0.07) | 7.30 (0.07) | <0.01 |
Umbilical vein pH, mean (SD) | 7.33 (0.07) | 7.34 (0.08) | 7.35 (0.07) | 7.34 (0.07) | <0.01 |
NICU admission (%) | 809 (15.2) | 602 (15.8) | 522 (13) | 745 (12.9) | <0.01 |
PTB | |||||
Separated by type | |||||
Medically indicated PTB, 37 wk | |||||
Apgar score 1, mean (SD) | 5.3 (2.8) | 5.8 (2.7) | 6.5 (2.4) | 6.5 (2.4) | <0.01 |
Apgar score 5, mean (SD) | 7.6 (1.8) | 7.5 (2.1) | 8.3 (1.7) | 8.2 (1.6) | <0.01 |
Umbilical artery pH, mean (SD) | 7.29 (0.11) | 7.30 (0.09) | 7.30 (0.10) | 7.29 (0.09) | 0.40 |
Umbilical vein pH, mean (SD) | 7.32 (0.10) | 7.32 (0.09) | 7.33 (0.1) | 7.32 (0.10) | 0.41 |
NICU admission (%) | 256 (84.5) | 214 (85.3) | 244 (72.8) | 287 (72.1) | <0.01 |
Spontaneous PTB, 37 wk | |||||
Apgar score 1, mean (SD) | 7.1 (1.9) | 7.3 (2) | 7.3 (1.8) | 7.3 (2.1) | 0.74 |
Apgar score 5, mean (SD) | 8.1 (1.5) | 8.4 (1.2) | 8.6 (1.1) | 8.5 (1.4) | <0.01 |
Umbilical artery pH, mean (SD) | 7.31 (0.08) | 7.33 (0.08) | 7.3 (0.10) | 7.32 (0.08) | 0.03 |
Umbilical vein pH, mean (SD) | 7.34 (0.09) | 7.35 (0.09) | 7.35 (0.13) | 7.35 (0.10) | 0.89 |
NICU admission (%) | 112 (62.6) | 89 (59.7) | 77 (54.6) | 141 (66.5) | 0.15 |
Separated by gestational week | |||||
PTB 34–36 wk | |||||
Apgar score 1, mean (SD) | 7.1 (1.9) | 7.3 (1.9) | 7.6 (1.6) | 7.5 (1.7) | <0.01 |
Apgar score 5, mean (SD) | 8.3 (1.2) | 8.5 (1.1) | 8.7 (1.1) | 8.7 (1) | <0.01 |
Umbilical artery pH, mean (SD) | 7.3 (0.1) | 7.31 (0.08) | 7.3 (0.08) | 7.3 (0.07) | 0.28 |
Umbilical vein pH, mean (SD) | 7.33 (0.09) | 7.34 (0.09) | 7.34 (0.1) | 7.34 (0.08) | 0.58 |
NICU admission (%) | 191 (63.2) | 161 (63.6) | 146 (53.7) | 212 (57.8) | 0.05 |
PTB 28–33 wk | |||||
Apgar score 1, mean (SD) | 4.6 (2.8) | 5.4 (2.6) | 6.6 (2) | 6.3 (2.5) | <0.01 |
Apgar score 5, mean (SD) | 7.4 (1.6) | 7.4 (1.9) | 8.5 (1.4) | 8.2 (1.5) | <0.01 |
Umbilical artery pH, mean (SD) | 7.31 (0.09) | 7.32 (0.09) | 7.31 (0.1) | 7.3 (0.11) | 0.52 |
Umbilical vein pH, mean (SD) | 7.33 (0.1) | 7.33 (0.09) | 7.34 (0.1) | 7.33 (0.12) | 0.95 |
NICU admission (%) | 142 (97.3) | 117 (95.9) | 112 (80) | 157 (86.7) | <0.01 |
PTB 22–27 wk | |||||
Apgar score 1, mean (SD) | 2.7 (1.9) | 2.6 (2.1) | 3.8 (2.3) | 3.7 (2.5) | <0.01 |
Apgar score 5, mean (SD) | 5.1 (2.4) | 4.6 (2.5) | 7.2 (2.6) | 6.8 (2.4) | <0.01 |
Umbilical artery pH, mean (SD) | 7.28 (0.12) | 7.32 (0.07) | 7.28 (0.14) | 7.28 (0.12) | 0.59 |
Umbilical vein pH, mean (SD) | 7.28 (0.11) | 7.31 (0.08) | 7.31 (0.15) | 7.29 (0.14) | 0.78 |
NICU admission (%) | 38 (90.5) | 28 (90.3) | 68 (94.4) | 63 (95.5) | 0.65 |
LBW | |||||
Apgar score 1, mean (SD) | 6.7 (2.4) | 6.9 (2.3) | 7.1 (2.1) | 7.2 (2.1) | <0.01 |
Apgar score 5, mean (SD) | 8.2 (1.5) | 8.2 (1.6) | 8.6 (1.4) | 8.5 (1.3) | <0.01 |
Umbilical artery pH, mean (SD) | 7.30 (0.09) | 7.31 (0.08) | 7.30 (0.09) | 7.30 (0.08) | <0.01 |
Umbilical vein pH, mean (SD) | 7.33 (0.09) | 7.33 (0.09) | 7.34 (0.10) | 7.33 (0.09) | 0.40 |
NICU admission (%) | 447 (59.4) | 380 (64.3) | 385 (55.7) | 525 (57.8) | 0.02 |