Psichometric equivalence of an improved Basic Languaje Morningness (BALM) Scale using industrial population within comparisons

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      <subfield code="a">An existing 13-item composite circadian rhythm "morningness" scale was simplified into a "Basic Language Morningness" (BALM) scale at a seventh grade (12-13 years) reading level. It was given to 150 each of continuously rotating shiftworkers and fixed-schedule dayworkers in an industrial manufacturing plant. Multiple factor analyses confirmed three prior identified factors, morningness/effort, morning alert, and evening</subfield>
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      <subfield code="g">Vol. 36, nº 1-3, January-March 1993 ; p. 191-197</subfield>
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