Table 2. Spearman bivariate correlation between TB and the variables T, N and DOI in the whole cohort.

	T old	T 8 ed	DOI 2-tier	DOI 3-tier	N
	n = 126	n = 132	n = 130	n = 130	n = 139
TB 2-tier	r = 0.009	r = 0.050	r = 0.074	r = 0.075	r = 0.210
	CI: -0.152–0.188	CI: -0.108–0.212	CI: -0.094–0.221	CI: -0.103–0.238	CI: 0.033–0.392
	p = 0.919	p = 0.566	p = 0.403	p = 0.397	p = 0.013*
TB 3-tier	r = 0.003	r = 0.043	r = 0.070	r = 0.066	r = 0.185
	CI: -0.172–0.179	CI: -0.124–0.199	CI: -0.107–0.211	CI: -0.107–0.220	CI: -0.052–0.358
	p = 0.975	p = 0.624	p = 0.429	p = 0.459	p = 0.030*

n = number of cases

r = Spearman's Rho

CI = Confidence interval

p = significance (two-tailed)