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. Author manuscript; available in PMC: 2024 May 1.
Published in final edited form as: Alcohol. 2022 Dec 5;108:30–43. doi: 10.1016/j.alcohol.2022.11.004

Table 5.

Day-level repeated-measures correlations between Skyn, SCRAM, and Self-Reported drinking variables

Comparisons Drinking intensity (drinks consumed vs. peak TAC or peak TAC vs. peak TAC)a Drinking intensity (drinks consumed vs. AUC or AUC vs. AUC)b Drinking duration (morning EMA vs. time with TAC > 0)c
rrm (df) [95% CI] rrm (df) [95% CI] rrm (df) [95% CI]
Skyn versus self-report 0.35 (259) [0.23, 0.47]*** 0.52 (259) [0.43, 0.62]*** 0.36 (259) [0.25, 0.47]***
SCRAM versus self-report 0.78 (67) [0.64, 0.87]*** 0.79 (67) [0.66, 0.87]*** 0.31 (95) [0.12, 0.56]**
Skyn versus SCRAM 0.51 (68) [0.19, 0.75]*** 0.80 (68) [0.59, 0.92]*** 0.63 (87) [0.51,0.78]***
Drinking duration (Event-contingent EMA vs. Time with TAC > 0)d,e Estimated BAC (Morning EMA vs. Peak TAC)f Estimated BAC (Event-contingent EMA vs. Peak TAC)f
Comparisons rrm (df) [95% CI] rrm (df) [95% CI] rrm (df) [95% CI]
Skyn versus self-report 0.37 (230) [0.23, 0.52]*** 0.30 (259) [0.15, 0.41]*** 0.23 (222) [0.10, 0.39]***
SCRAM versus self-report 0.29 (89) [0.12, 0.50]** 0.61 (67) [0.41, 0.77]*** 0.42 (61) [0.16, 0.68]***
Estimated BAC (Morning EMA vs. AUC)f Estimated BAC (Event-contingent EMA vs. AUC)f
Comparisons rrm (df) [95% CI] rrm (df) [95% CI]
Skyn versus self-report 0.48 (259) [0.35, 0.60]*** 0.42 (222) [0.16, 0.62]***
SCRAM versus self-report 0.59 (67) [0.42, 0.72]*** 0.48 (61) [0.10, 0.71]***
Rise rate g Fall rate g
Comparisons rrm (df) [95% CI] rrm (df) [95% CI]
Skyn versus SCRAM 0.18 (65) [−0.10, 0.50] 0.25 (68) [0.02, 0.44]*

Notes: SCRAM = Secure Continuous Remote Alcohol Monitor; TAC = Transdermal Alcohol Concentration; AUC = Area Under the Curve; EMA = Ecological Momentary Assessment; df = Degrees of freedom; CI = Confidence Interval

***

p < .001;

**

p < .01;

*

p < .05

a

For Skyn and SCRAM versus self-report, this is the number of self-reported drinks versus peak TAC. For Skyn versus SCRAM, this is comparisons of day-level peak TAC measured by both devices.

b

For Skyn and SCRAM versus self-report, this is the number of self-reported drinks versus AUC. For Skyn versus SCRAM, this is comparisons of day-level AUC measured by both devices.

c

For Skyn and SCRAM versus self-report, this is the amount of time spent drinking based on the morning EMA report. For Skyn versus SCRAM, this is the total amount of time with TAC > 0 μg/L air or TAC > 0 g/dL, respectively.

d

For Skyn and SCRAM versus self-report, this is the amount of time spent drinking based on the event-contingent EMA versus timewith TAC > 0 μg/L air (Skyn) or TAC > 0 g/dL (SCRAM).

e

There are no values reported for Skyn versus SCRAM because the comparison for drinking duration is reported in the column labeled “Drinking Duration (Morning EMA vs. Time with TAC > 0).

f

Estimated BAC was not compared for Skyn versus SCRAM because there is not a validated approach for estimating BAC from Skyn data.

g

There are no values comparing Skyn versus self-report or SCRAM versus self-report because the self-report data did not permit calculations of rise and fall rates.