Table 2. Statistical strategies to select variables.

Categorical variables	X2	Odds ratio
Sex	0.896 (p 0.344)	1.17 (0.843–1.63)
Chronic inducible urticaria	0.089 (p 0.785)	1.05 (0.773–1.42)
Anxiety/Depression	18.7 (p <0.007)	1.99 (1.45–2.72)
Autoimmunity	0.149 (p 0.6)	0.92 (0.62–1.37)
NSAIDs reactions	1.74 (p 0.1)	1.33 (0.86–2.06)
Angioedema	69.4 (p <0.001)	3.55 (2.62–4.81)
Atopy	0.032 (p 0.8)	1.03 (0.76–1.36)
Age transformed	10 (p 0.001)	2.45 (1.99–3.01)
Continuous variables	p
Age	0.117
Urticaria duration	0.001
BMI	0.574
UAS7 baseline	<0.001
IgG anti-TPO	0.579
Eosinophils	0.791
PCR	0.576

Statistical criteria depended on whether the variable was continuous (x², Odds ratio) or categorical (Independent samples Mann-Whitney U test). NSAIDs: Non-steroidal anti-inflammatory drugs “Time”; Time from disease onset, “BMI”; the body mass index, “age transformed”; categories ≤49 and ≥50 years.