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Weight centile spaces
On UK-WHO growth charts, a weight centile space is the interval between adjacent centile lines, used to describe a fall in a child's weight trajectory.
The term counts the intervals crossed between adjacent centile lines, rather than the lines themselves. NICE uses weight-centile-space falls on UK-WHO charts as thresholds for concern about faltering growth. For children born between the 9th and 91st centiles, a fall across at least two spaces is one threshold; the thresholds differ for birthweights outside that range.