Table 1.
Singleton Pregnancy Demographic Dataa by Thyroid Disease Status in the Consortium on Safe Labor, 2002–2008
| No Thyroid Disease (n = 216,901) |
Primary Hypothyroidism (n = 3,183) |
Iatrogenic Hypothyroidism (n = 178) |
Hyperthyroidism (n = 417) |
Other or Unspecified Thyroid Disease (n = 2,833) |
||||||
|---|---|---|---|---|---|---|---|---|---|---|
| No. | % | No. | % | No. | % | No. | % | No. | % | |
| Pregnancies contributed | ||||||||||
| 1 | 198,265 | 91.4 | 2,829 | 88.9 | 145 | 81.5 | 357 | 85.6 | 2,577 | 91.0 |
| 2 | 17,726 | 8.2 | 338 | 10.6 | 32 | 18.0 | 51 | 12.2 | 240 | 8.5 |
| ≥3 | 910 | 0.4 | 16 | 0.5 | 1 | 0.6 | 9 | 2.2 | 16 | 0.6 |
| Prepregnancy weightb | ||||||||||
| Underweight | 7,804 | 3.6 | 87 | 2.7 | 5 | 2.8 | 14 | 3.4 | 89 | 3.1 |
| Normal weight | 76,917 | 35.5 | 1,003 | 31.5 | 53 | 29.8 | 111 | 26.6 | 1,027 | 36.3 |
| Overweight | 32,358 | 14.9 | 528 | 16.6 | 25 | 14.0 | 55 | 13.2 | 533 | 18.8 |
| Obese | 15,232 | 7.0 | 257 | 8.1 | 21 | 11.8 | 27 | 6.5 | 248 | 8.8 |
| Morbidly obese | 11,630 | 5.4 | 244 | 7.7 | 17 | 9.6 | 27 | 6.5 | 246 | 8.7 |
| BMI unknown | 72,960 | 33.6 | 1,064 | 33.4 | 57 | 32.0 | 185 | 44.4 | 690 | 24.4 |
| Nulliparous | 87,127 | 40.2 | 1,118 | 35.1 | 55 | 30.9 | 132 | 31.7 | 809 | 28.6 |
| Race/ethnicity | ||||||||||
| Non-Hispanic white | 105,802 | 48.8 | 2,420 | 76.0 | 127 | 71.4 | 189 | 45.3 | 1,965 | 69.4 |
| Non-Hispanic black | 49,588 | 22.9 | 209 | 6.6 | 27 | 15.2 | 144 | 34.5 | 294 | 10.4 |
| Hispanic | 38,380 | 17.7 | 300 | 9.4 | 14 | 7.9 | 48 | 11.5 | 327 | 11.5 |
| Asian/Pacific Islander | 8,977 | 4.1 | 109 | 3.4 | 4 | 2.3 | 20 | 4.8 | 101 | 3.6 |
| Other | 5,202 | 2.4 | 32 | 1.0 | 2 | 1.2 | 3 | 0.7 | 57 | 2.0 |
| Unknown | 89,521 | 4.1 | 113 | 3.6 | 4 | 2.3 | 13 | 3.1 | 89 | 3.1 |
| Health insurance | ||||||||||
| Private | 120,044 | 55.4 | 2,412 | 75.8 | 144 | 80.9 | 227 | 54.2 | 2,140 | 75.5 |
| Public or self-pay | 73,608 | 33.9 | 483 | 15.2 | 29 | 16.3 | 161 | 38.6 | 584 | 20.6 |
| Other | 310 | 0.1 | 6 | 0.2 | 1 | 0.6 | 2 | 0.5 | 0 | 0 |
| Unknown | 22,939 | 10.6 | 282 | 8.9 | 4 | 2.3 | 27 | 6.5 | 109 | 3.9 |
| Any chronic diseasec | 35,233 | 16.2 | 829 | 26.0 | 47 | 26.4 | 125 | 30.0 | 590 | 20.8 |
| Smoking | 14,591 | 6.7 | 144 | 4.5 | 12 | 6.7 | 43 | 10.3 | 143 | 5.1 |
Abbreviations: BMI, body mass index; SD, standard deviation.
a Age is missing for 0.1% of observations. Maternal age is expressed in years as the mean (SD): for no thyroid disease, 27.5 (6.2); for primary hypothyroidism, 31.5 (5.3); for iatrogenic hypothyroidism, 31.0 (5.3); for hyperthyroidism, 28.9 (5.9); and for other or unspecified thyroid disease, 30.4 (5.6).
b Maternal prepregnancy weight is calculated as BMI (weight (kg)/height (m)2) and is categorized as underweight if BMI < 18.5; normal weight if BMI = 18.5–24.9; overweight if BMI = 25.0–29.9; obese if BMI = 30.0–34.9; and morbidly obese if BMI ≥ 35.0.
c Chronic diseases include depression; asthma; diabetes; heart, renal, or gastrointestinal disease; and hypertension.