biostudies-literaturePitchik HOBill and Melinda Gates Foundation93https://www.ebi.ac.uk/biostudies/studies/S-EPMC9976496biostudies-literatureUnknown23(1)<h4>Background</h4>Reliable and valid measurement of early child development are necessary for the design of effective interventions, programs, and policies to improve early child outcomes. One widely used measure in low- and middle-income countries (LMICs) is the Bayley Scales of Infant and Toddler Development III (Bayley-III). Alternatively, the Bangladeshi-adapted Ages and Stages Questionnaire Inventory (ASQ:I) can be administered more quickly, inexpensively, and with less training than the Bayley-III. We aimed to assess the concurrent validity of the Bangladeshi-adapted ASQ:I with the Bayley-III in children 4-27 months old in rural Bangladesh.<h4>Methods</h4>The sample was a sub-sample (n = 244) of endline participants from an evaluation of an early child development intervention (JulyBMC pediatricsConcurrent validity of the Ages and Stages Questionnaire Inventory and the Bayley Scales of Infant and Toddler Development in rural Bangladesh.PMC9976496OPP1146808Akter FLuby SPSultana JPitchik HOTofail FWinch PJShoab AKMHuda TMNFernald LCHRahman MfalseConcurrent validity of the Ages and Stages Questionnaire Inventory and the Bayley Scales of Infant and Toddler Development in rural Bangladesh.<h4>Background</h4>Reliable and valid measurement of early child development are necessary for the design of effective interventions, programs, and policies to improve early child outcomes. One widely used measure in low- and middle-income countries (LMICs) is the Bayley Scales of Infant and Toddler Development III (Bayley-III). Alternatively, the Bangladeshi-adapted Ages and Stages Questionnaire Inventory (ASQ:I) can be administered more quickly, inexpensively, and with less training than the Bayley-III. We aimed to assess the concurrent validity of the Bangladeshi-adapted ASQ:I with the Bayley-III in children 4-27 months old in rural Bangladesh.<h4>Methods</h4>The sample was a sub-sample (n = 244) of endline participants from an evaluation of an early child development intervention (July2023-01-01T00:00:00Z2023 Mar2025-05-18T12:54:53.955Z2025-04-05T13:02:31.102ZS-EPMC99764963685907010.1186/s12887-022-03800-6