Table 3:

Agreement between proximal and distal first trimester hair cortisol concentrations according to method of cortisol analysis

Immunoassay (N=97)
	Proximal logHCC tertiles
Distal logHCC tertiles	Low	Mid	High
Low	13 (43.3%)	12 (35.3%)	7 (21.2%)
Mid	8 (26.7%)	11 (32.4%)	14 (42.4%)
High	9 (30.0%)	11 (32.4%)	12 (36.4%)
Total	30 (100.0%)	34 (100.0%)	33 100.0%)
Weighted Kappa statistic = 0.10
Intra-class correlation coefficient = 0.46
Between-person variation = 0.40
Total variation = 0.86
Liquid Chromatography (N=28)
	Proximal logHCC tertiles
Distal logHCC tertiles	Low	Mid	High
Low	3 (37.5%)	5 (45.5%)	2 (22.2%)
Mid	2 (25.0%)	3 (27.3%)	3 (33.3%)
High	3 (37.5%)	3 (27.3%)	4 (44.4%)
Total	8 (100.0%)	11 (100.0%)	9 (100.0%)
Weighted Kappa statistic = 0.07
Intra-class correlation coefficient = 0.34
Between-person variation = 0.19
Total variation = 0.55

Bolded values indicate the diagonal cells of agreement.

Abbreviations: logHCC = log-transformed hair cortisol concentrations