nif:isString
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In an effort to account for the combined effect of both duration and number of the different patterns, two composite Z-scores representing patterns of ST [ST-COMP = Z-score ST-10 (number/day) + Z-score ST-10 (minutes/day)] and patterns of BST [BST-COMP = Z-score BST (number/day) + Z-score BST (minutes/day)] were then computed.
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