[Retracted] Analysis of Adverse Pregnancy Outcomes of Pregnant Women with Syphilis and Maternal-Infant Serological Association in Changzhou, China, 2015–2019

Table 1

General information of the research objects and comparison of the incidence of adverse pregnancy outcomes.

General information	Number of research objects	Constituent ratio (%)	Adverse pregnancy outcomes
			Number of cases	Incidence (%)
Age					2.59	0.46
<25	91	18.61	30	32.97	—	—
25~	197	40.29	64	32.49	—	—
30~	115	23.52	35	30.43	—	—
>=35	86	17.59	35	40.70	—	—
Nationality					0.63	0.426
Han nationality	471	96.32	157	33.33	—	—
The other	18	3.68	7	38.89	—	—
Degree of education					3.43	0.488
Primary school and below	40	8.18	16	40.00	—	—
Junior high school	148	30.27	50	33.78	—	—
High school	134	27.4	50	37.31	—	—
College/university	111	22.7	31	27.93	—	—
Unknown	56	11.45	17	30.36	—	—
Occupation					8.32	0.139
Worker	84	17.18	31	36.90	—	—
Farmer	27	5.52	5	18.52	—	—
Business	49	10.02	15	30.61	—	—
Professional skill worker	13	2.66	3	23.08	—	—
Housework or unemployed	234	47.85	74	31.62	—	—
The other	82	16.77	36	43.90	—	—
Marital status					3.63	0.057
First marriage	396	80.98	125	31.57	—	—
The other	93	19.02	39	41.94	—	—
Previous infection					0.97	0.324
Yes	212	43.35	66	31.13	—	—
No	277	56.65	98	35.38	—	—
Diagnosis period					6.86	0.032
Pregnancy	424	86.91	133	31.37	—	—
During childbirth	37	7.57	17	45.95	—	—
After delivery	28	5.52	14	50.00	—	—
Weeks of first antenatal visit					0.80	0.849
<13	321	65.64	106	33.02	—	—
13-	116	23.72	39	33.62	—	—
>=28	46	9.41	16	34.78	—	—
Unknown	6	1.23	3	50.00	—	—
Weeks of diagnosis of syphilis infection					6.54	0.038
<13	126	25.77	33	26.19	—	—
13-	155	31.70	49	31.61	—	—
>=28	208	42.54	82	39.42	—	—
Titers of first antenatal visit					7.88	0.005
<8	382	78.12	116	30.37	—	—
>=8	107	21.88	48	44.86	—	—
Syphilis treatment					5.06	0.025
Yes	311	63.6	93	29.90	—	—
No	178	36.4	71	39.89	—	—
Whether to standardize treatment					4.69	0.030
Yes	136	43.73	32	23.53	—	—
No	175	56.27	61	34.86	—	—
Gravidity					0.55	0.760
1	97	19.84	31	31.96	—	—
2-3	256	52.35	84	32.81	—	—
≥4	136	27.81	49	36.03	—	—
Parity					3.59	0.167
0	195	39.88	72	36.92	—	—
1	205	41.92	59	28.78	—	—
≥2	89	18.20	33	37.08	—	—
Number of children					0.66	0.720
0	207	42.33	73	35.27	—	—
1	206	42.13	65	31.55	—	—
≥2	76	15.54	26	34.21	—	—
Number of spontaneous abortions					1.84	0.399
0	413	84.46	137	33.17	—	—
1	44	9.00	13	29.55	—	—
≥2	32	6.54	14	43.75	—	—
Number of artificial terminations of pregnancy					0.33	0.847
0	276	56.44	90	32.61	—	—
1	118	24.13	42	35.59	—	—
≥2	95	19.43	32	33.68	—	—
Stillbirth					0.01	0.905
0	463	94.68	155	33.48	—	—
1	26	5.32	9	34.62	—	—
Syphilis stage					3.87	0.276
Unknown	109	22.29	29	26.61	—	—
Phase II	4	0.82	2	50.00	—	—
Phase I	21	4.29	6	28.57	—	—
Recessive	355	72.60	127	35.77	—	—
Route of infection					4.77	0.189
Unknown	298	60.94	94	31.54	—	—
Mother-to-child transmission	1	0.20	0	0.00	—	—
Sexual transmission	181	37.01	69	38.12	—	—
Blood transmission	9	1.84	1	11.11	—	—
Husband/partner’s current syphilis infection					3.43	0.331
Unknown	207	42.33	69	33.33	—	—
Infected	35	7.16	9	25.71	—	—
Uninfected	102	20.86	30	29.41	—	—
Not detected	145	29.65	56	38.62	—	—
Total	489	100	164	33.54	—	—