Table 1 Demographics of individuals in study population by preterm status (n (%))
Characteristic | Preterm | Term |
|---|---|---|
Total | 2,335,880 (10) | 20,369,188 (90) |
Maternal race | ||
White, non-Hispanic | 1,139,435 (49) | 11,719,095 (58) |
Black, non-Hispanic | 524,453 (22) | 2,771,770 (14) |
Hispanic | 524,477 (22) | 4,462,084 (22) |
Other | 128,440 (5) | 1,239,083 (6) |
Missing | 19,075 (1) | 177,156 (1) |
Marital status | ||
Married | 1,308,539 (56) | 13,482,654 (66) |
Unmarried | 1,027,341 (44) | 6,886,534 (34) |
Maternal age | ||
< 20 | 335,318 (14) | 2,213,480 (11) |
20–29 | 1,186,750 (51) | 10,700,735 (53) |
30–39 | 744,495 (32) | 6,982,810 (34) |
> 39 | 69,317 (3) | 472,163 (2) |
Maternal education | ||
< HS | 613,828 (26) | 4,295,592 (21) |
HS | 761,100 (33) | 6,145,251 (30) |
> HS | 923,370 (40) | 9,665,601 (47) |
Missing | 37,582 (2) | 262,744 (1) |
Rural–urban stratum | ||
Metropolitan urbanized | 1,956,542 (84) | 17,214,809 (85) |
Nonmetropolitan urbanized | 156,155 (7) | 1,320,384 (6) |
Less urbanized | 179,568 (8) | 1,469,263 (7) |
Thinly populated/rural | 33,138 (1) | 279,532 (1) |