Humans human 391 female 317 male 304 Female 292 Male 274 child 262 Child 238 child parent relation 203 psychology 189 adolescent 163 Adolescent 158 adult 151 preschool child 147 Child, Preschool 144 Adult 130 Parents 127 Article 105 controlled study 99 questionnaire 86 Parenting 82 Surveys and Questionnaires 78 major clinical study 73 infant 71 article 63 physiology 63 Infant 60 longitudinal study 60 mother 60 young adult 56