Motor Developmental Delay in 7500 Iranian Infants: Prevalence and Risk Factors

The purpose of this study was to determine the prevalence and the most common risk factors of motor developmental delay in infants.Following ethical approval, a study was carried out on the prevalence and risk factors of infants with motor developmental delay. The first stage was conducted through a cross-sectional study to determine the prevalence of motor developmental delay on 7500 infants and the second stage was an analytic case - control survey to identify the most common risk factors on 140 infants, aged one month to three years with motor developmental delay. Data was collected using a demographic questionnaire, the Parents Evaluation of Developmental Status questionnaire, the Denver Developmental Screening Test II, a neurological assessment form, and the movement and tone assessment form.The prevalence of motor developmental delay in 7500 infants was 18.7/1000. The most common risk factors in infants with motor developmental delay were prematurity (25.6%), low birth weight (19.2%), neonatal seizures (7.5%), hyaline membrane disease (6.7%), systemic infections of mothers during pregnancy (5.9%), severe neonatal hyperbilirubinemia (5%) in sequence. Motor developmental delay was significantly correlated with consanguinity of parents (p=0.001), prematurity (p=0.046), abnormal head circumference at birth (p=0.038), and low birth weight (p=0.026).The prevalence of motor developmental delay appears to be high and further studies should focus on different preventive strategies, controlling the most common risk factors and emphasizing on early detection and treatment of high risk infants.