Multivariate Analysis of Thyrotropin in Preterm Newborns Based on Adequacy of Weight for Gestational Age

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Title: Multivariate Analysis of Thyrotropin in Preterm Newborns Based on Adequacy of Weight for Gestational Age
Authors: Bosch-Giménez, Vicente | Palazón Bru, Antonio | Blasco-Barbero, Álvaro | Juste-Ruiz, Mercedes | Rizo-Baeza, Mercedes | Cortés Castell, Ernesto
Research Group/s: Salud y Cuidados en Grupos Vulnerables (SACU)
Center, Department or Service: Universidad de Alicante. Departamento de Enfermería
Keywords: Thyrotropin | Newborns | Preterm | Intrauterine growth | Gestational age
Knowledge Area: Enfermería
Issue Date: 1-Jan-2017
Publisher: Mary Ann Liebert
Citation: Thyroid. 2017, 27(1): 120-124. doi:10.1089/thy.2016.0338
Abstract: Background: Different and conflicting data have been published concerning thyrotropin (TSH) levels among small-for-gestational-age (SGA) and appropriate-for-gestational-age (AGA) newborns. The hypothesis of this study was that SGA preterm infants have higher TSH levels than those who are not underweight do. Methods: This cross-sectional study analyzed the TSH levels of all preterm newborns with a negative congenital hypothyroidism screening result (TSH <7.5 μIU/mL). Secondary variables were sex, birth weight (SGA, AGA), days of life at blood extraction, maternal origin, gestational age, and being a twin or not. Two multiple linear regression models were constructed comparing TSH levels in SGA and AGA or the z-score for birth weight and the remaining variables. Results: A sample including 5819 preterm infants was obtained: 53.8% male, 23.3% twins, and 3.3% SGA. TSH concentrations were 2.16 ± 2.0 μIU/mL for the SGA infants and 1.80 ± 1.5 μIU/mL for the AGA infants (p = 0.012), with a negative correlation (p < 0.001) between TSH levels and the z-score for the weight of the newborn. The multivariate analysis comparing TSH levels between SGA and AGA gave the following: SGA (B = 0.46, p < 0.001), Latin American mother (B = −0.16, p = 0.029), days of life at blood extraction (B = −0.26, p < 0.001), and gestational age ≤28 weeks (B = −0.56, p < 0.001). Using the z-score for the weight, the associations were: maternal origin North Africa (B = 0.19, p = 0.042), days of life at blood extraction (B = −0.27, p < 0.001), gestational age ≤28 weeks (B = −0.55, p < 0.001), and z-score for weight (B = −0.12, p < 0.001). Conclusions: Our multivariate analysis suggests that TSH concentrations are higher in SGA infants than they are in AGA infants, and this should be taken into account when establishing a reference interval appropriate for this population. The clinical relevance remains unknown, but lines of research are opened that may allow a better understanding of the long-term morbidities in these newborns.
ISSN: 1050-7256 (Print) | 1557-9077 (Online)
DOI: 10.1089/thy.2016.0338
Language: eng
Type: info:eu-repo/semantics/article
Rights: © Mary Ann Liebert, Inc.
Peer Review: si
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Appears in Collections:INV - SACU - Artículos de Revistas

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