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. Author manuscript; available in PMC: 2013 Jan 10.
Published in final edited form as: Cephalalgia. 2010 Apr 7;31(1):6–12. doi: 10.1177/0333102410365108

Figure 2.

Figure 2

(A) Mean cold pain thresholds and (B) mean cold tolerance thresholds (with 95% confidence interval) by headache group and body region. The main effect of headache group was significant for cold pain (F(2,57)=7.40; P=0.001) and cold tolerance (F(2,57)=10.4; P<0.001). For cold pain, significant headache group pair-wise comparisons include EM (14.9°C) vs CTL (6.6°C; P=0.001); CM (11.7°C) vs CTL did not quite reach statistical significance (P=0.053). For cold tolerance, CM (10.5°C) vs CTL (4.0°C) was only significant in the head region (P=0.007). EM (head 12.2°C, arm 3.7°C) differed from CTL (head 4.0°C, arm 0.2°C) in both the head (P<0.001) and arm (P=0.023). The main effect of body region (head vs arm) was significant for cold pain (F(1,57)=105.7; P<0.001; mean difference 7.7°C) and cold tolerance (F(1,57)=177.3; P<0.001; mean difference 7.1°C). The interaction of headache group and region was not significant for cold pain (F(2,57)=0.34; P=0.711) but was significant for cold tolerance (F(2,57)=9.4; P<0.001).

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