Table 3. Contingency table for cold-pain thresholds.

Gender	Category	Low 5-HTT	High 5-HTT
Male	cold- pain	7	5
	no cold- pain	2	3
Female	cold- pain	4	12
	no cold- pain	8	3

Number of subjects perceiving cold-pain during testing of thermal thresholds, i.e. reporting pain above 0°C during threshold assessment.