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

Table 3.

Comparison of the headache duration (hour; mean±SD)

	Group GON (n=53)	Group PGON (n=25)	p
Before block	18.51±9.43	15.20±9.16	0.147
Week 1	11.62±11.46^*	5.52±5.54^*, ^¶	0.004
Week 2	11.49±12.27^*	5.84±5.64^*, ^¶	0.011
Week 3	10.21±8.92^*	7.08±7.49^*	0.123
Week 4	9.60±8.06^*	4.36±3.99^*, ^¶	0.001
2^nd month	10.37±7.72^*	7.16±4.40^*	0.060
3^rd month	8.02±5.58^*	7.20±4.16^*	0.526

^*

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

^¶

p<0.05, when compared between groups.

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