48 • PERINATOLOGY Vol 24 • No. 1 • May–Aug 2023 Brief Analysis Permatasari RD. Correlation Between the Gestational Age Estimated Using LMP, USG, and the NBS 188 had incomplete data on medical records. Therefore, 216 women were enrolled for this study. The demographic details and the GA estimation analysis using LMP, USG, and NBS are given in Table 1. In this study, most of the newborns were male (54.2%), and most of the pregnant women were multigravida (68.9%). USG examination was primarily performed in the third trimester (94.4%). Most of the neonates were in the moderate- to late-preterm category. Table 2 shows that the average GA estimation using LMP was 34±3 weeks, using USG was 33±3 weeks, and using NBS was 34±3 weeks. Table 2. Estimation of GA Using LMP, USG, and NBS (N = 216) Method of GA Estimation Minimum Maximum Mean Standard Deviation LMP 25 43 34.17 3.46 USG 23 39 33.34 3.25 NBS 24 40 34.59 3.32 GA, gestational age; LMP; last menstrual period; NBS, New Ballard Score; USG, ultrasonogram. Table 3 shows that GA estimations using LMP and USG, LMP and NBS, as well as USG and NBS were statistically significant, with a strong degree of correlation. Table 3. Correlation of GA Estimations Using LMP, USG, and NBS Method of GA Estimation LMP USG NBS LMP Pearson correlation 1 .867a .801a Significance (2-tailed) .000 .000 N 216 216 216 USG Pearson correlation .867a 1 .783a Significance (2-tailed) .000 .000 N 216 216 216 NBS Pearson correlation .801a .783a 1 Significance (2-tailed) .000 .000 — N 216 216 216 GA, gestational age; LMP; last menstrual period; NBS, New Ballard Score; USG, ultrasonogram. aCorrelation is significant at the 0.01 level (2-tailed). Discussion In this study, there were 216 pregnant women, and 117 male neonates and 99 female neonates. Most pregnant women were multigravida. USG examination was primarily performed in the third trimester. Most neonates were in the moderate-term to late-preterm category. Table 1. Demographic Details and the GA Estimation Analysis of the Study Population Parameter No. of Cases, n (%) Obstetric Status Primigravida 67 (31.1) Multigravida 149 (68.9) Sex of the Neonate Male 117 (54.2) Female 99 (45.8) USG Performed Trimester 1 — Trimester 2 12 (5.6) Trimester 3 204 (94.4) Gestational Age Using LMP Extremely Preterm 11 (5.1) Very Preterm 30 (13.9) Moderate to Late Preterm 116 (53.7) Term 58 (26.9) Postterm 1 (0.4) Gestational Age Using USG Extremely Preterm 12 (5.5) Very Preterm 36 (16.7) Moderate to Late Preterm 124 (57.4) Term 44 (20.4) Postterm — Gestational Age Using NBS Extremely Preterm 8 (3.7) Very Preterm 22 (10.2) Moderate to Late Preterm 116 (53.7) Term 70 (32.4) Postterm — GA, gestational age; LMP; last menstrual period; NBS, New Ballard Score; USG, ultrasonogram.
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