(1) The board shall determine whether a bargaining unit is appropriate by determining whether the employees share a community of interest. A community of interest is determined by considering the following factors:
(c) fringe benefits and other working conditions;
(d) the history of collective bargaining;
(e) common supervision;
(f) common personnel policies;
(g) extent of integration of work functions and interchange among employees affected; and
(h) desires of the employees.
(2) The board shall consider the following factors in addition to those listed in (1) when considering a proposed bargaining unit for nurses working at a health care facility, as defined in 39-32-102, MCA:
(a) similarity of duties;
(b) licensure; and
(c) conditions of employment.