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. 2012 Dec 27;7(12):e52780. doi: 10.1371/journal.pone.0052780

Table 1. The distribution of gestation week(GW) of preterm birth.

Hospitals	Sample number	Gestation week	20∼27⁺⁶GW		28∼31⁺⁶ GW		32∼33⁺⁶ GW		34∼36⁺⁶ GW
			n	percentage (%)	n	percentage (%)	n	percentage (%)	n	percentage (%)
Haidian MCH	651	34.46±3.009	34	5.2	23	3.5	52	8.0	542	83.3
Tongzhou MCH	322	33.98±3.578	24	7.5	18	5.6	21	6.5	259	80.4
Shunyi MCH	174	34.87±1.856	3	1.7	6	3.4	15	8.6	150	86.2
Changping MCH	140	34.72±1.714	0	0	10	7.1	14	10.0	116	82.9
Daxing MCH	104	34.40±3.139	7	6.7	4	3.8	5	4.8	88	84.6
Total	1391	34.42±2.953	68	4.9	61	4.4	107	7.7	1155	83.0