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Proportionality and gender in small-for-dates and large-for-dates babies
Insights
Head-for-weight indices varied significantly among small-for-dates (SFD), average-for-dates (AFD), and large-for-dates (LFD) infants. Boys generally exhibited higher indices than girls, with instrumental delivery also correlating with higher indices.
Area of Science:
- Pediatrics
- Neonatology
- Human Growth and Development
Background:
- Infant size at birth, categorized as small-for-dates (SFD), average-for-dates (AFD), or large-for-dates (LFD), is a critical indicator of perinatal health.
- Understanding anthropometric indices like head-for-weight can provide insights into infant proportionality and potential developmental trajectories.
- Previous research has explored various factors influencing birth weight and infant measurements, but specific proportionality indices require further investigation.
Purpose of the Study:
- To calculate and compare head-for-weight indices across different infant size-for-dates groups.
- To investigate sex-based differences in head-for-weight indices within these groups.
- To explore associations between head-for-weight indices and perinatal factors, including mode of delivery and maternal history.
Main Methods:
- Calculation of head-for-weight indices for 420 small-for-dates (SFD), 338 average-for-dates (AFD), and 445 large-for-dates (LFD) infants.
- Statistical analysis to compare mean index values between groups, considering sex and delivery method.
- Exploration of correlations between indices and identified perinatal risk factors.
Main Results:
- Mean head-for-weight indices were highest in the SFD group and lowest in the LFD group.
- Significant differences in indices were observed between AFD and LFD groups (girls and both sexes combined).
- Boys consistently showed significantly higher mean indices than girls, with a sex difference approximately double the SFD-LFD difference. Instrumental delivery was associated with higher mean indices across all groups.
Conclusions:
- Head-for-weight index demonstrates distinct patterns related to infant size-for-dates, with SFD infants showing higher proportionality by this measure.
- Sex is a significant determinant of head-for-weight index, with males exhibiting greater proportionality.
- While mode of delivery is associated with index variations, other investigated perinatal factors did not show significant associations with proportionality in SFD infants.
Abstract:
The head-for-weight indices of 420 small-for-dates (SFD), 338 average-for-dates (AFD) and 445 large-for-dates (LFD) babies were calculated. The mean values were highest in the SFD group and lowest in the LFD group. Significant differences were found between AFD and LFD groups for girls and both sexes together. Within each group the mean value for boys was significantly higher than for girls. The absolute difference between the sexes was about twice the difference between the SFD and LFD groups. In the SFD group no associations could be found between their proportionality by this measure, and the factors associated with their slow intra-uterine growth rate. 60.8% multiparae in the LFD group had previously given birth to relatively large babies. The mean index of the probands in this subgroup was higher than when previous siblings had been of average birth-weight. In all three groups the mean index was higher for babies delivered instrumentally than for those who had spontaneous vaginal deliveries. No differences were found for other perinatal risk factors.