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Tardiness hair in transitional zone: Analysis between age and frontal forehead hairline in children aged below 5
Wenting Wu1, Ye Liu2, Yu Zhang1
1Department of Dermatology, Peking University Third Hospital, Beijing, China.
Insights
Frontal hairline patterns in Chinese children aged 0-5 years show Type II and Type III are most common. Age negatively correlates with hairline type, with a non-linear inverse J-shaped relationship observed.
Area of Science:
- Pediatric Dermatology
- Human Morphology
- Developmental Biology
Background:
- Frontal hairline morphology is a key characteristic in pediatric physical examination.
- Understanding hairline development in early childhood is crucial for accurate clinical assessment.
Purpose of the Study:
- To characterize frontal hairline patterns in Chinese infants and young children (0-5 years).
- To investigate the relationship between age and frontal hairline morphology in this demographic.
Main Methods:
- A cross-sectional study of 213 Chinese children aged 0-5 years.
- Classification of hairline types (I-IV) based on frontotemporal angle measurements.
- Analysis of age-related changes using ordinal logistic regression and restricted cubic splines.
Main Results:
- Type II (40.8%) and Type III (39.4%) hairlines were most prevalent.
- A significant negative correlation was found between age and hairline type.
- A non-linear, inverse J-shaped relationship between age and hairline type was identified.
Conclusions:
- Type II and Type III frontal hairlines are predominant in Chinese children aged 0-5 years.
- Age is a significant factor influencing frontal hairline morphology in early childhood.
Objective:
This study aimed to investigate the morphological characteristics and distribution of frontal hairline patterns among Chinese infants and young children aged 0-5 years and to explore the correlation between age and hairline morphology.
Methods:
A cross-sectional study was conducted on 213 infants and young children aged 0-5 years in the Dermatology Department of the Third Hospital of Peking University between February 2017 and February 2023. Participants are divided into four types based on the angle formed between the line connecting the point at the frontotemporal angle of the hairline and the tragus and the coronal plane[greater than 30 degrees (Type I), 15-30 degrees (Type II), 0-15 degrees (Type III), and less than 0 degrees (Type IV)]. The presence of temporal peak and skin color phototypes were also recorded. Ordinal logistic regression and restricted cubic splines were used to analyze the relationship between age and hairline phenotype.
Results:
Among the 213 participants, Type II (40.8%) and Type III (39.4%) hairlines were the most prevalent, while Type I (6.6%) was the least common. Multivariate regression analysis revealed a negative correlation between age and hairline type, which persisted after adjusting for potential confounding factors such as gender, temporal bulge, and skin phototype. Restricted cubic spline analysis further revealed a non-linear, inverse J-shaped relationship between age and hairline type.
Conclusion:
In infants and young children aged 0-5 years old, Type II and Type III frontal hairline patterns were most relevant. A negative correlation between age and hairline type were observed in this population.
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