Secular trends of macrosomia in southeast China, 1994-2005

Lu, Yanyu; Zhang, Jun; Lu, Xinrong; Xi, Wei; Li, Zhu

doi:10.1186/1471-2458-11-818

BMC Public Health

Table 1 Temporal trends of maternal and infants characteristics in southeast China from 1994 to 2005.

From: Secular trends of macrosomia in southeast China, 1994-2005

Variables	1994	1995	1996	1997	1998	1999	2000	2002	2003	2004	2005
No. of Newborns	64, 986	67, 353	58, 548	58, 854	53, 011	49, 102	54, 208	45, 104	42, 566	53, 103	47, 637
Male (%)*	52.03	51.58	51.67	51.71	51.67	51.60	51.80	52.54	52.54	52.81	52.30
Nulliparity (%)*	84.32	84.54	82.80	83.95	84.24	85.93	86.15	87.94	88.76	88.52	87.00
Gestational age(d, mean ± SD)#	280.38 ± 9.21	280.81 ± 9.10	280.63 ± 9.02	280.04 ± 8.72	280.00 ± 8.60	280.07 ± 8.42	279.82 ± 8.31	278.39 ± 8.04	278.25 ± 7.96	278.49 ± 7.86	278.15 ± 7.87
Gestational age distribution (%)*
37 weeks	5.60	4.93	5.01	5.28	5.13	4.76	4.66	5.92	5.73	5.19	5.64
38 weeks	13.91	12.80	13.01	13.49	13.50	12.92	13.41	16.53	16.99	16.22	16.81
39 weeks	26.58	26.43	26.84	28.33	28.15	28.88	29.72	33.05	33.6	34.19	34.90
40 weeks	29.59	30.21	30.44	30.94	32.00	32.34	32.60	29.82	29.81	30.23	29.48
41 weeks	16.77	17.72	17.25	16.23	15.85	16.04	14.84	11.70	11.11	11.19	10.39
≥42 weeks	7.55	7.90	7.46	5.73	5.37	5.05	4.77	2.98	2.76	2.98	2.78
Maternal age (%)*
≤24 y	58.24	54.45	50.61	46.39	44.59	46.23	47.38	50.34	49.22	46.70	44.96
25-29 y	30.78	34.23	36.31	40.39	42.06	41.86	39.59	36.70	37.72	40.61	41.13
30-34 y	10.10	10.41	12.16	12.09	11.71	10.12	11.10	10.81	10.63	10.29	10.98
≥35 y	0.87	0.91	0.91	1.14	1.63	1.78	1.93	2.15	2.43	2.40	2.93
Maternal education (%)*
College or above	3.03	3.29	3.44	4.48	5.51	6.62	8.06	10.73	12.14	16.51	20.71
High school	13.40	14.46	15.38	16.96	19.08	21.99	23.71	28.83	30.99	32.96	30.45
Junior school	58.79	61.04	62.26	63.35	62.66	60.57	58.57	53.42	50.56	45.28	43.07
Elementary school or less	24.77	21.20	18.92	15.21	12.75	10.82	9.66	7.01	6.31	5.25	5.77
Maternal height(%)*
≤1.56 m	27.98	26.47	26.96	26.16	26.37	25.85	25.56	25.02	24.59	23.39	23.61
1.57-1.61 m	44.06	44.95	44.86	45.05	44.29	44.66	44.55	44.24	44.41	44.91	45.08
≥1.62 m	27.95	28.58	28.18	28.79	29.34	29.48	29.89	30.74	31.00	31.69	31.31
Maternal BMI(%)*
< 18.5 kg/m ²	19.07	20.44	19.61	21.22	20.48	20.61	20.90	20.64	20.87	19.00	18.88
18.5-22.9 kg/m ²	67.83	67.61	67.53	66.41	66.73	66.09	65.65	64.5	63.61	63.12	61.54
23-24.9 kg/m ²	9.85	8.81	9.39	8.93	9.09	9.29	9.38	9.72	10.08	11.04	11.77
≥25 kg/m ²	3.26	3.14	3.47	3.44	3.71	4.00	4.07	5.15	5.44	6.84	7.82
Net gestational weght gain(Kg, mean ± SD)#	7.80 ± 4.80	8.75 ± 4.81	8.66 ± 4.69	9.35 ± 4.67	9.66 ± 4.65	10.13 ± 4.63	10.22 ± 4.59	10.11 ± 4.86	10.32 ± 5.01	10.05 ± 5.28	10.09 ± 5.44
Net gestational weight gain (%)*
< 6.5 kg	38.44	31.13	31.55	25.83	23.38	20.43	19.43	20.62	19.82	21.41	21.59
6.5~12.5 kg	46.04	48.34	48.54	50.52	50.57	50.45	50.57	49.19	47.47	46.87	45.28
> 12.5 kg	15.52	20.53	19.91	23.65	26.06	29.12	30.00	30.2	32.71	31.72	33.13
City (%)*	21.87	24.86	23.95	29.36	31.31	32.72	35.36	33.4	36.21	38.27	40.84

Missing data on: maternal age, 0.05%; parity, 0.13%; maternal education, 0.48%; maternal height, 4.36%; maternal early pregnancy BMI, 8.94%; gestational weight gain, 11.00%.
* Based on χ2 test for linear trend
# Based on linear-contrast one-way analysis of variance.

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