Table 2.

Mean, standard deviation, minimum and maximum scores of perceived stress in three stages of study in research units

Perceived stress variable	Mean±SD	Minimum	Maximum
Perceived stress before training
Intervention group	30.1750±6.53153	19.00	47.00
Control group	28.2750±8.57841	9.00	63.00
Perceived stress after training
Intervention group	19.9500±4.78754	10.00	29.00
Control group	24.9500±5.42052	9.00	36.00
Perceived stress after amniocentesis
Intervention group	21.7250±4.60205	13.00	33.00
Control group	23.9000±5.66048	9.00	34.00

SD=Standard deviation