Table 2.

Relationship between reported colour changes and baseline thermographic assessment

Colour change	Thermographic assessment	Symptom absent	Symptom present	p value
Whole cohort
White	Digits	31 (8.3)	29.2 (7.5)	0.59
	Dorsum	31.1 (4.8)	30.4 (4.2)	0.57
	Thermal gradient	−0.4 (3.1)	−0.6 (3.0)	0.36
Blue	Digits	31.7 (7.4)	27.8 (7.0)	0.005
	Dorsum	31.4 (4.3)	29.7 (4.7)	0.007
	Thermal gradient	−0.20 (2.6)	−1.8 (3.2)	0.059
Red	Digits	30.1 (7.4)	30 (7.8)	0.87
	Dorsum	30.4 (4.2)	30.7 (4.7)	0.88
	Thermal gradient	−0.5 (3.2)	−0.7 (2.8)	0.64
Purple	Digits	31.4 (6.6)	28.5 (8.0)	0.031
	Dorsum	31.3 (3.8)	29.8 (4.9)	0.05
	Thermal gradient	−0.3 (2.5)	−1.1 (3.4)	0.067
Primary Raynaud’s phenomenon
White	Digits	31.4 (8.3)	27.9 (7.2)	0.20
	Dorsum	31.6 (4.7)	29.8 (4.6)	0.12
	Thermal gradient	−0.4 (3.4)	−1.5 (3.0)	0.38
Blue	Digits	30.5 (7.7)	27.4 (8.6)	0.017
	Dorsum	31.1 (4.3)	29.5 (5.0)	0.023
	Thermal gradient	−0.4 (2.8)	−2.0 (3.2)	0.133
Red	Digits	29.5 (7.4)	27.4 (7.3)	0.52
	Dorsum	30.3 (4.3)	29.6 (4.8)	0.48
	Thermal gradient	−0.6 (3.3)	−1.4 (2.8)	0.61
Purple	Digits	30.4 (6.8)	27.2 (8.0)	0.13
	Dorsum	30.4 (4.0)	29.6 (5.5)	0.20
	Thermal gradient	−0.4 (2.4)	−1.8 (3.3)	0.12
Fibromyalgia syndrome
White	Digits	30.8 (8.2)	32.2 (7.4)	0.30
	Dorsum	30.6 (5.0)	32.0 (4.2)	0.15
	Thermal gradient	0.1	−0.01 (3.3)	0.60
Blue	Digits	32.5 (6.4)	30.8 (7.2)	0.22
	Dorsum	32.1 (3.8)	31.4 (4.2)	0.31
	Thermal gradient	0.02 (2.5)	−0.7 (3.7)	0.48
Red	Digits	31.4 (7.1)	32.2 (7.5)	0.94
	Dorsum	31.4 (4.1)	32.0 (4.3)	0.68
	Thermal gradient	0.2 (3.2)	−0.02 (2.9)	0.42
Purple	Digits	32.3 (6.0)	31.2 (7.9)	0.09
	Dorsum	32.1 (3.6)	30.8 (4.1)	0.15
	Thermal gradient	0.02 (2.9)	−0.01 (3.8)	0.35