Table 3.

Logistic regression analysis and area under the ROC curve for unadjusted models of CAD.

Variable	24-h		Awake		Sleep
	ORn [95% CI]	AUC	ORn [95% CI]	AUC	ORn [95% CI]	AUC
PIPH	3.66 [2.57–5.21]	0.765	3.97 [2.75–5.73]	0.776	1.79 [1.38–2.31]	0.652
PIPS	1.27 [1.00–1.61]	0.562	1.11 [0.89–1.39]	0.530	1.76 [1.34–2.32]	0.652
W0	0.27 [0.20–0.36]	0.820	0.26 [0.19–0.35]	0.832	0.70 [0.56–0.88]	0.609
W1	0.19 [0.14–0.28]	0.846	0.26 [0.19–0.36]	0.814	0.26 [0.19–0.36]	0.802
${\text{W}}_1^{\text{H}}$	0.27 [0.20–0.37]	0.802	0.39 [0.30–0.51]	0.747	0.27 [0.20–0.37]	0.798
${\text{W}}_1^{\text{H}*}$	0.17 [0.12–0.25]	0.852	0.21 [0.15–0.30]	0.837	0.31 [0.23–0.41]	0.778
${\text{W}}_1^{\text{S}}$	0.53 [0.42–0.67]	0.675	0.46 [0.36–0.59]	0.700	1.02 [0.81–1.28]	0.511
${\text{W}}_1^{\text{S}*}$	0.18 [0.12–0.26]	0.837	0.20 [0.14–0.30]	0.832	0.73 [0.57–0.93]	0.571
W2	3.68 [2.62–5.17]	0.783	3.79 [2.68–5.35]	0.794	1.85 [1.43–2.39]	0.660
${\text{W}}_2^{\text{H}}$	2.04 [1.56–2.67]	0.680	2.39 [1.78–3.21]	0.702	1.32 [1.04–1.66]	0.585
${\text{W}}_2^{\text{H}*}$	4.05 [2.90–5.65]	0.809	4.41 [3.08–6.31]	0.819	2.33 [1.79–3.04]	0.712
${\text{W}}_2^{\text{S}}$	0.67 [0.54–0.85]	0.605	0.58 [0.46–0.74]	0.636	1.06 [0.84–1.33]	0.516
${\text{W}}_2^{\text{S}*}$	1.31 [1.04–1.65]	0.582	1.42 [1.11–1.82]	0.596	0.65 [0.51–0.82]	0.630
${\text{W}}_2^{\text{M}}$	1.47 [1.15–1.88]	0.605	1.42 [1.12–1.81]	0.594	1.47 [1.15–1.87]	0.607
W3	4.32 [2.96–6.31]	0.790	3.23 [2.34–4.46]	0.759	4.56 [2.99–6.94]	0.790
${\text{W}}_3^{\text{H}}$	6.95 [3.80–12.7]	0.771	4.59 [2.74–7.70]	0.734	5.12 [2.83–9.25]	0.746
${\text{W}}_3^{\text{H}*}$	4.36 [2.81–6.77]	0.759	2.74 [1.95–3.86]	0.705	4.66 [2.79–7.79]	0.760
${\text{W}}_3^{\text{S}}$	1.13 [0.89–1.42]	0.526	1.01 [0.80–1.26]	0.505	1.61 [1.19–2.16]	0.624
${\text{W}}_3^{\text{S}*}$	2.79 [2.05–3.81]	0.728	2.47 [1.86–3.28]	0.714	2.83 [2.03–3.94]	0.731
${\text{W}}_3^{\text{M}}$	3.75 [2.60–5.42]	0.767	2.94 [2.14–4.05]	0.735	3.84 [2.61–5.66]	0.772

Values presented are normalized odds ratio (OR_n), 95% confidence intervals (95% CI) and area under the receiver operating characteristic curve (AUC). CAD, coronary artery disease; PIP, percentage of inflection points; W_j, 0 ≤ j ≤ 3, group of words containing j inflection points; superscripts: H, hard inflection points; S, soft inflection points; M, mixed inflection points, i.e., a combination of hard and soft inflection points. Word groups for which the type of inflection point is not specified comprise words with all types of inflection points. The percentage of word groups without “^*” was calculated over the total number of NN words. The percentages of words in the groups $W_j^{H*}$ and $W_j^{S*}$ were calculated over the total number of NN words with only hard and only soft inflection points, respectively. The percentages of words in the other groups were calculated over the total number of NN words.