RESUMO
<p><b>OBJECTIVE</b>To investigate the developmental level of joint attention ability in children aged 16-30 months and factors influencing the developmental level.</p><p><b>METHODS</b>A questionnaire survey was performed among 1 675 children aged 16-30 months who visited the Department of Child Health Care in Guangdong Women and Children's Hospital between September and December, 2016 to investigate their joint attention ability and related influencing factors.</p><p><b>RESULTS</b>Of the 1 675 children, 1 579 (94.27%) had reactive joint attention ability at the age of 16-30 months, and 1 428 (85.25%) had active joint attention ability. The percentages of children with reactive joint attention ability and active joint attention ability in boys were lower than in girls (P<0.001). Mother's age, father's occupation, annual family income, way of conception, intended or unintended pregnancy, and mode of delivery were factors influencing the total score of joint attention ability and the scores of reactive/active joint attention ability (P<0.05).</p><p><b>CONCLUSIONS</b>Most children have reactive joint attention ability and active joint attention ability at the age of 16-30 months. During this period of age, boys tend to have poorer joint attention ability than girls. Mother's age, father's occupation, annual family income, way of conception, intended or unintended pregnancy, and mode of delivery are associated with the development of joint attention.</p>