. 2014 Jul 29;6(6):144–153. doi: 10.5539/gjhs.v6n6p144

Table 3.

The comparison of the average of general (overall) severity of the symptoms of premenstrual syndrome before and after treatment in students of the dormitories of Jahrom University in 2013

Treatment stage	Vitamin B1 group	Placebo group	Result of test (Mann- Whitney)
Treatment stage	Average of score + standard deviation	Average of score + standard deviation	Result of test (Mann- Whitney)
Before treatment	47.49 ± 0.34	47.40 ± 0.54	NS
After one month treatment	23.45 ± 0.83	45.40 ± 0.76	0.0001< P
After two months treatment	15.40 ± 0.52	35.40 ± 0.76	0.0001< P
The average of reduction of general severity of the symptoms after treatment	32.09 ± 0.73	12 ± 0.49	0.0001< P
Intra – group difference	0.0001< P	0.001< P
(Wilcoxon test)

The average general severity of the symptoms of premenstrual syndrome has been reduced in Vitamin B1 group after treatment.