Table 1 Characteristics of eligible mothers and infants with only one weight measure and included in the study
Maternal and infant characteristics | At least one weight (n = 710) | At least two weight (n = 490) | Only one weight (n = 220) | P value |
|---|---|---|---|---|
No. (%), mean (SD) | No. (%), mean (SD) | No. (%), mean (SD) | ||
Maternal age (at consent) | 28 (6.0) | 29 (6.1) | 27 (5.4) | < 0.01 |
Recruitment site | ||||
LAC + USC | 132 (18.6) | 83 (16.9) | 49 (22.2) | 0.09 |
Eisner | 492 (69.3) | 351 (71.6) | 141 (64.1) | |
USC Obstetrics and Gynecology | 57 (8.0) | 41 (8.4) | 16 (7.3) | |
Community Recruit | 5 (0.7) | 3 (0.6) | 2 (0.9) | |
South Central Clinic | 24 (3.4) | 12 (2.5) | 12 (5.5) | |
Race/ethnicity | ||||
White (non-Hispanic) | 37 (5.5) | 30 (6.2) | 7 (3.8) | 0.02 |
Black (non-Hispanic) | 85 (12.7) | 56 (11.5) | 29 (15.8) | |
Hispanic | 523 (78.1) | 388 (79.8) | 135 (73.4) | |
Multiracial, non-Hispanic | 9 (1.3) | 4 (0.8) | 5 (2.7) | |
Other, non-Hispanic | 16 (2.4) | 8 (1.7) | 8 (4.3) | |
Maternal education | ||||
< 12th Grade | 172 (25.7) | 120 (24.6) | 52 (28.4) | 0.71 |
High school | 209 (31.2) | 150 (30.8) | 59 (32.2) | |
Some college | 179 (26.7) | 132 (27.1) | 47 (25.7) | |
Complete college | 73 (10.9) | 56 (11.5) | 17 (9.3) | |
Graduate training | 37 (5.5) | 29 (6) | 8 (4.4) | |
Household Income | ||||
Less than $15,000 | 138 (20.6) | 91 (18.7) | 47 (25.5) | 0.17 |
$15,000 to $29,999 | 163 (24.3) | 118 (24.2) | 45 (24.5) | |
$30,000 to $49,999 | 76 (11.3) | 57 (11.7) | 19 (10.3) | |
$50,000 to $99,999 | 38 (5.7) | 25 (5.1) | 13 (7.1) | |
$100,000 or more | 34 (5.1) | 29 (6.0) | 5 (2.7) | |
Do not know | 222 (33.1) | 167 (34.3) | 55 (29.9) | |
Diabetic disorders | ||||
Normal | 460 (66.5) | 323 (66.6) | 137 (66.2) | 0.33 |
Glucose intolerant | 136 (19.7) | 94 (19.4) | 42 (20.3) | |
Gestational diabetes mellitus | 62 (9.0) | 40 (8.3) | 22 (10.6) | |
Chronic diabetes | 34 (4.9) | 28 (5.8) | 6 (2.9) | |
Hypertensive disorders | ||||
Normal | 551 (78.5) | 388 (79.4) | 163 (76.5) | 0.74 |
Preeclampsia-eclampsia | 65 (9.2) | 42 (8.6) | 23 (10.8) | |
Chronic hypertension | 26 (3.7) | 16 (3.3) | 10 (4.7) | |
Chronic hypertension with preeclampsia | 16 (2.3) | 12 (2.5) | 4 (1.9) | |
Gestational hypertension | 44 (6.3) | 31 (6.3) | 13 (6.1) | |
Pre-pregnancy BMI | ||||
Underweight (BMI < 18.5) | 18 (2.6) | 11 (2.2) | 7 (3.2) | 0.38 |
Normal (BMI of 18.5 to < 25) | 212 (30) | 137 (28.0) | 75 (34.5) | |
Overweight (BMI of 25 to < 30) | 218 (30.8) | 154 (31.5) | 64 (29.5) | |
Class 1 Obese (BMI of 30 to < 35) | 151 (21.4) | 107 (21.8) | 44 (20.3) | |
Class 2 Obese (BMI of 35 to < 40) | 63 (8.9) | 49 (10.0) | 14 (6.5) | |
Class 3 Obese (BMI of 40 or higher) | 45 (6.4) | 32 (6.5) | 13 (6.0) | |
Birth weight (g) | 3260 (500) | 3290 (500) | 3210 (500) | 0.08 |
Gestational age at birth (weeks) | 39 (1.8) | 39 (1.8) | 39 (1.8) | 0.70 |