. 2021 Oct 19;11(10):e055635. doi: 10.1136/bmjopen-2021-055635

Table 1.

Definitions of indicators measuring employment stability (main independent variables)

Measure	Definition
Turnover rate	$= \frac{t o t a l n u m b e r o f e x i t s i n d e f i n e d p e r i o d}{a v e r a g e n u m b e r o f e m p l o y e e s i n d e f i n e d p e r i o d}$
Stability rate	$= \frac{N u m b e r o f e m p l o y e e s a t s t a r t o f d e f i n e d p e r i o d w h o r e m a i n e m p l o y e d a t e n d o f d e f i n e d p e r i o d}{N u m b e r o f e m p l o y e e s a t s t a r t o f d e f i n e d p e r i o d}$
Agency nurse proportion	$= \frac{A g e n c y - e m p l o y e d n u r s e F T E}{T o t a l F T E n u r s e p o s i t i o n s}$

FTE, full-time equivalent.