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. 2016 Mar 1;53(1):45–48. doi: 10.5152/npa.2015.10003

Table 2.

Comparison of the headache attack frequency (mean±SD)

	Group GON (n=53)	Group PGON (n=25)	p
Before block	15.73±7.21	13.76±8.07	0.303
Week 1	2.49±1.93	1.52±1.12^#	0.007
Week 2	1.92±1.46	1.64±1.18	0.364
Week 3	1.86±1.42	1.60±1.04	0.353
Week 4	1.54±1.29	1.04±0.97	0.060
1st month (mean of weeks 1–4)	7.83±4.78^*	5.80±3.59^*	0.064
2^nd month	5.58±4.37^*	5.00±2.51^*	0.458
3^rd month	4.52±3.61^*	3.28±2.15^*	0.068

^*

p<0.05, when compared with the value before the block;

^#

p<0.05, when compared between groups.

GON: greater occipital nerve block; PGON: prophylaxis and greater occipital nerve block; SD: standard deviation.