Table 4.

Correlations and levels of significance of biochemical data in 20 patients with Cushing Disease. Hair cortisol values (measured in pmol/g dry hair weight) were log₁₀-transformed for normality when undergoing statistical analysis.

	Hair cortisol segment (distance in cm from scalp)	Average UFC/BSA over D1+D2 (nmol/24h/m2)		Average 17OHS/Cr over D1+D2 (mmol/24h/mol Cr)		Midnight serum cortisol (nmol/L)		Early morning serum cortisol (nmol/L)		Midnight serum ACTH (pmol/L)		Early morning serum ACTH (pmol/L)
		r	p	r	p	r	p	r	P	r	p	r	p
1	Proximal	0.2	0.3	−0.05	0.8	0.2	0.5	0.2	0.4	−0.1	0.6	−0.08	0.8
2	Medial	0.02	0.9	−0.1	0.6	0.01	1.0	0.04	0.9	−0.05	0.9	−0.1	0.7
3	Distal	−0.05	0.8	−0.2	0.5	−0.04	0.9	−0.2	0.5	−0.05	0.8	−0.1	0.7
Average over 3 cm		0.06	0.8	−0.1	0.6	0.04	0.9	0.03	0.9	−0.08	0.8	−0.1	0.7

Statistical significance was considered for p’s<0.05. D1+D2=Day 1 and Day 2.