Table 2

Regression coefficients (95% confidence intervals) and effect sizes from multiple linear regression models predicting physiologic response

Variable^*	Δ SBP	η²	Δ DBP	η²	Δ mean RR	η²	Δ RMSSD	η²	Δ Cortisol	η²
Group, unadjusted	−0.062 (−0.128 to 0.004)	0.058	−0.082 (−0.190 to 0.027)	0.038	−0.011 (−0.065 to 0.043)	0.003	−0.076 (−0.291 to 0.139)	0.009	−0.153 (−0.354 to 0.048)	0.039
Group, adjusted	−0.045 (−0.146 to 0.056)	0.015	−0.068 (−0.231 to 0.095)	0.013	0.036 (−0.044 to 0.117)	0.016	0.199 (−0.084 to 0.482)	0.037	−0.281 (−0.554 to −0.008)^†	0.077
Smoking	0.003 (−0.019 to 0.025)	0.002	−0.008 (−0.044 to 0.027)	0.004	0.006 (−0.012 to 0.023)	0.008	0.011 (−0.050 to 0.073)	0.003	−0.077 (−0.137 to −0.017)^†	0.115
BMI	0.005 (−0.011 to 0.021)	0.008	0.016 (−0.010 to 0.042)	0.029	0.010 (−0.003 to 0.023)	0.045	0.087 (0.041 to 0.132)^†	0.221	0.050 (0.007 to 0.093)^†	0.095
Alcohol	0.020 (−0.062 to 0.103)	0.005	0.045 (−0.089 to 0.178)	0.009	−0.035 (−0.100 to 0.031)	0.021	−0.021 (−0.253 to 0.210)	0.001	0.068 (−0.154 to 0.291)	0.007
Drugs	−0.038 (−0.150 to 0.075)	0.009	−0.007 (−0.189 to 0.174)	0.000	0.021 (−0.068 to 0.110)	0.004	0.172 (−0.143 to 0.487)	0.023	0.115 (−0.195 to 0.426)	0.011
Medication	0.017 (−0.104 to 0.139)	0.002	−0.046 (−0.242 to 0.151)	0.004	0.030 (−0.066 to 0.127)	0.007	−0.138 (−0.478 to 0.203)	0.013	−0.189 (−0.528 to 0.151)	0.024
Contraceptive pill	−0.012 (−0.091 to 0.067)	0.002	−0.062 (−0.189 to 0.065)	0.018	−0.026 (−0.088 to 0.036)	0.013	−0.214 (−0.434 to 0.006)	0.068	−0.010 (−0.221 to 0.202)	0.000

BMI = body mass index; DBP = diastolic blood pressure; NSSI = nonsuicidal self-injury; RMSSD = root mean square of successive differences; RR = interbeat interval; SBP = systolic blood pressure.
↵* Group coded as NSSI (1), controls (2). Adjusted for BMI (continuous), use of medication (yes/no), contraceptive pill (yes/no), number of cigarettes smoked (categorical), alcohol use in the past 30 d (yes/no) and drugs used in the past 30 d (yes/no). One participant was excluded from the analysis on cortisol because she was taking cortisol. The variables SBP, DBP, Cortisol, mean RR and RMSSD were log-transformed before analysis.
↵† p < 0.05.