Table A1.

Inclination signature (IS) feature set.

Feature ID	Feature Symbol	Feature Definition	Description
1	${\theta }^{*}$	$max\left({\theta }^j\right)$	Maximum inclination angle during drink event
2	D	length(${\theta }^j$)	Duration of drinking event
3–11	$A_{{\theta }_k}$	$count\left({\theta }^j<T\left(k\right)\right),k=1$ $count\left(T\left(k-1\right)\le {\theta }^j<T\left(k\right)\right)$ $k\in \left\{2,7\right\}$ $count\left({\theta }^j\ge T\left(k\right)\right),k=8$ $T\left(k\right)\in \left\{{20}^{°},\dots ,{90}^{°}\right\}$	Number of samples for which inclination angle satisfies specified amplitude range criteria
12–20	$A{R}_{P_k}$	$count\left(\frac{{\theta }^j}{{\theta }^{*}}<P\left(k\right)\right),k=1$ $count\left(P\left(k-1\right)\le \frac{{\theta }^j}{{\theta }^{*}}<P\left(k\right)\right),$ $k\in \left\{2,7\right\}$ $count\left(\frac{{\theta }^j}{{\theta }^{*}}\ge P\left(k\right)\right),k=8$ $P\left(k\right)\in \left\{20\%,\dots ,90\%\right\}$	Number of samples for which normalized inclination angle satisfies relative amplitude criteria
21	$Q_{\theta }$	$\frac{{\theta }^{*}}{D}$	Ratio of maximum inclination value to duration
22	$\overline{\theta }$	$mean\left({\theta }^j\right)$	Mean inclination angle
23	$D_{{\theta }_R}$	$\frac{argmax\left({\theta }^j\right)}{D-argmax\left({\theta }^j\right)}$	Ratio of time for which inclination angle is increasing relative to decreasing
24–25	$S_{\theta }, S_{\theta }^T$	$T{\displaystyle \sum _{m=1}^U}{\theta }_m^j$	Riemann sum approximation to integral of inclination curve over entire duration ($U=D$) or inclination interval ($U=argmax\left({\theta }^j\right)$)
26	$R{E}_{\theta }$	$\frac{{\theta }^{*}-{\theta }_1}{argmax\left({\theta }^j\right)-1}$	Slope of line intersecting inclination trajectory start of trajectory time of maximum value
27	$F{E}_{\theta }$	$\frac{{\theta }_D-{\theta }^{*}}{D-argmax\left({\theta }^j\right)}$	Slope of line intersecting inclination trajectory at time of maximum value and end of trajectory
28/29	${{\theta }_T^{\prime }}^{*}$/ ${{\theta }_A^{\prime }}^{*}$	$\max \left({\theta {\left(1:argmax\left({\theta }^j\right)\right)}^{\prime }}^j\right)$/ $\max \left({\theta {\left(argmax\left({\theta }^j\right):D\right)}^{\prime }}^j\right)$	Maximum rate of inclination/declination, where ${\theta }^{\prime j}$ is a numerical estimate of the derivative of ${\theta }^j$
30/31	${\overline{\theta }}_T^{\prime }$/ ${\overline{\theta }}_A^{\prime }$	$mean\left({\theta {\left(1:argmax\left({\theta }^j\right)\right)}^{\prime }}^j\right)$/ $mean\left({\theta {\left(argmax\left({\theta }^j\right):D\right)}^{\prime }}^j\right)$	Mean rate of inclination/declination
32/33	$s_{{\theta }_T^{\prime }}$/ $s_{{\theta }_A^{\prime }}$	$std\left({\theta {\left(1:argmax\left({\theta }^j\right)\right)}^{\prime }}^j\right)$/ $std\left({\theta {\left(argmax\left({\theta }^j\right):D\right)}^{\prime }}^j\right)$	Standard deviation of inclination/declination rate