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Frequency of dosing errors based on dosing intervals. 
, >18 h; 
, >30 h; 
, >42 h; 
, >54 h; 
, >56 h; 
>66 h; 
, >78 h. Lines show the frequency at which patients miss one or more twice daily or once daily doses, presented as specified intervals of time between doses (e.g. an interval of >18 h corresponds to missing one twice daily dose; an interval of >30 h corresponds to missing two consecutive twice daily doses or one once daily dose)
