title: Normal anal position index in Thai newborns.
abstract: BACKGROUND
  The quantitative measurement of the normal anal position by anal position index (API) has been reported from various institutes. The existing API data appear to vary among the ethnic differences. To date, the normal anal position in Thai children has never been reported.
  
  
  OBJECTIVE
  Aim of the present study was to establish the normal values of the API in Thai newborns.
  
  
  METHODS
  A cross-sectional study of 403 normal newborn born at Srinakharinwirot University Hospital between November 2003 and September 2004 was performed Demographic data and anal position index are reported separately for each gender split. Correlations between API and other anthropometric parameters were tested.
  
  
  RESULTS
  There was significant difference of API between males (0.51 +/- 0.07; 95% CI 0.50 to 0.52) and females (0.38 +/- 0.08; 95% CI 0.37 to 0.39). API was not different between preterm and term newborn in each gender split. API had no significant correlation with gestational age (r=0.018, p-value = 0.71), birth weight (r=0.014, p-value = 0.79), birth length (r=0.02, p-value = 0.69) and head circumference (r=0.047, p-value =
  
  
  CONCLUSIONS
  Analposition indexes in Thai newborn infants are 0.51 and 0.38 in male and female, respectively API had no correlation with gestational age and other anthropometric parameters such as birth weight, length, and head circumference.
authors.affiliation: Department of Pediatrics, Faculty of Medicine, Srinakharinwirot University, HRH Maha Chakri Sirindhorn Medical Center, 62 M 7 Rangsit-Nakhon Nayok Rd, Ongkaruck, Nakhon Nayok 26120, Thailand. sanguansak_r@hotmail.com
authors.forename: Sanguansak
authors.initials: S
authors.lastname: Rerksuppaphol
authors.forename: Lakkana
authors.initials: L
authors.lastname: Rerksuppaphol
mesh_terms: D001003:Anal Canal / Q000033:anatomy & histology*; D000886:Anthropometry; D002657:Child Development; D003430:Cross-Sectional Studies; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D012016:Reference Values; D013785:Thailand