Infant tummy time and floor play: a compiled evidence dataset

A compiled dataset of every published estimate of infant tummy time prevalence, assembled from peer-reviewed studies in six countries, together with an inventory of which studies have measured floor-based play as a construct distinct from tummy time. Each row records one reported estimate with the provenance that published comparisons omit: the construct actually asked about, the measurement instrument, the population type, the infant age band, the sample size and the year of data collection. A comparable_group field records which rows may legitimately be set beside one another. No new data was collected. Every figure is retyped from its source publication into a common schema; no source table, figure or passage is reproduced. Every row carries its citation and DOI, and all seven source DOIs were verified against Crossref.