Table 1.

Baseline characteristics of pregnancies in the thyrotoxicosis group (pregnancies with thyrotoxicosis) and the control group.

Outcome	Thyrotoxicosis Group (n = 408)	Control Group (n = 408)	p-Value
Mean maternal age; Year ± SD	29.0 ± 6.0	29.0 ± 5.7	0.981
Number of antenatal care visits: No. ± SD	9.7 ± 2.9	9.1 ± 3.4	0.522
Parity:			0.834
Nulliparous women	211 (51.7%)	208 (51.0%)
Parous women	197 (48.3%)	200 (49.0%)
Education:			0.920
High school or lower	71 (22.3%)	68 (22.7%)
Higher education (higher than high school; including vocational/high vocational certificate, Bachelor of Arts, Master of Arts/Doctor of Philosophy)	247 (77.7%)	232 (77.3%)
Residency:			0.034
Chiang Mai	178 (56.0%)	193 (64.3%)
Others (nearly all in the northern part of Thailand)	140 (44.0%)	107 (35.7%)