A study of the relationships between receptivity to both high and low exposure to components of the Kilimani Sesame intervention--a multimedia educational intervention developed by the Sesame Workshop--and the self-reported literacy, numeracy, social, emotional, health, and hygiene outcomes of participants, based on pre- and post-intervention interviews with 223 preschool children from the rural district of Kisarawe and the city of Dar es Salaam in Tanzania