Table 2.

Thermal Perception, Pain Perception, and Pain Tolerance Thresholds.

	Red Hair	Dark Hair	P
Data presented as medians [interquartile range]. Comparisons made with Mann-Whitney rank-sum test.
Cold Sensory Perception Threshold (°C)	30.7 [30.3, 31.0]	30.5 [29.9, 31.2]	0.596
Cold Pain Perception Threshold (°C)	22.6 [15.1, 26.1]	12.6 [0.0, 20.0]	0.004
Cold Pain Tolerance Threshold (°C)	6.0 [0.0, 9.7]	0.0 [0.0, 2.0]	0.001
Heat Sensory Perception Threshold (°C)	33.8 [33.5, 34.0]	33.5 [33.4, 33.8]	0.015
Heat Pain Perception Threshold (°C)	41.4 [39.7, 43.1]	42.4 [41.3, 44.6]	0.059
Heat Pain Tolerance Threshold (°C)	46.3 [45.7, 47.5]	47.7 [46.6, 48.7]	0.009