Table 4.

Relationship between BDI results, work schedule, and depression

BDI results	DW (n=289)	NDRSW (n=358)	DRSW (n=366)	P-value
Nondepressed (n=841)	82%	83%	84%	NS
Mild depression (n=138)	15%	14%	12%	NS
Moderate depression (n=31)	3%	2%	3%	NS
Severe depression (n=3)	0.3%	0.3%	0.3%	NS

Note: Shown are the data for each work schedule.

Abbreviations: BDI, Beck Depression Inventory; DW, day workers; NDRSW, night and day rotating shift workers; DRSW, day rotating shift workers; NS, not statistically significant.