| Characteristics | Number (%) |
| Age at delivery (years) |
|
| <16 | 48 (19.20) |
| 16 - 17 | 106 (42.40) |
| ≥18 | 96 (38.40) |
| Mean (SD) | 16.83 (1.45) |
| Min - Max | 13 - 19 |
| Education level |
|
| Primary school | 22 (8.80) |
| Junior high school | 111 (44.40) |
| Senior high school | 62 (24.80) |
| Vocational school | 55 (22.00) |
| BMI before pregnancy (kg/m2) |
|
| Normal (18.5 - 24.9) | 165 (66.00) |
| Underweight (16.0 - 18.4) | 73 (29.20) |
| Very underweight (<16.0) | 12 (4.80) |
| Family members |
|
| ≤5 | 198 (79.20) |
| >5 | 52 (20.80) |
| Mean (SD) | 5.03 (1.16) |
| Min - Max | 3 - 9 |
| Weight gain during pregnancy (kg) |
|
| ≥10 | 50 (20.00) |
| <10 | 200 (80.00) |
| Mean (SD) | 11.52 (2.57) |
| Min - Max | 6 - 20 |
| Number of parity |
|
| First | 229 (91.6) |
| Second | 21 (8.40) |
| Marital status |
|
| Lived with husband | 193 (77.20) |
| Widowed/divorced | 14 (5.60) |
| Separated | 43 (17.20) |
| Monthly family income (THB) |
|
| ≤10,000 | 61 (24.40) |
| 10,001 - 15,000 | 65 (26.00) |
| 15,001 - 20,000 | 55 (22.00) |
| 20,001 - 25,000 | 31 (12.40) |
| >25,000 | 38 (15.20) |
| Mean (SD) | 18000.00 (8433.06) |
| Min-Max | 6000 - 45,000 |
| Complications during pregnancy |
|
| No | 237 (94.80) |
| Yes | 13 (5.20) |
| First antenatal care visit (weeks) |
|
| ≤12 | 87 (34.80) |
| >12 | 163 (65.20) |
| Frequencies of antenatal care visits |
|
| ≥5 | 195 (78.00) |
| <5 | 55 (22.00) |
| Mean (SD) | 6.95 (2.77) |
| Min - Max | 2 - 14 |
| Daily iron and folic supplements during pregnancy |
|
| Yes | 202 (80.80) |
| No | 48 (19.20) |