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. Author manuscript; available in PMC: 2016 Nov 7.
Published in final edited form as: Gastrointest Endosc. 2011 Sep;74(3):496–503.e3. doi: 10.1016/j.gie.2011.05.022

Appendix Table.

Primary Results across different modeling specifications.

Vomiting
Nausea
Total Sympom Score (TSS)
Model 1: Full
Model
Model 2: Pooled
trt-effect
Model 3:
Parsimonious
Model
Model 1: Full
Model
Model 2: Pooled
trt-effect model
Model 3:
Parsimonious
Model
Model 1: Full
Model
Model 2: Pooled
trt-effect model
Model 3:
Parsimonious
Model
period 1

 slope (daily change)

  Group A (Stim on) −0.41 (−0.54,−0.29) p<0.001 −0.40 (−0.51, −0.29) p<0.001 −0.40 (−0.51, −0.29) p<0.001 −0.33 (−0.46, −0.20) p<0.001 −0.33 (−0.45, −0.22) p<0.001 −0.33 (−0.45, −0.22) p<0.001 −1.33 (−1.82, −0.84) p<0.001 −1.30 (−1.76, −0.85) p<0.001 −1.30 (01.76, −0.85) p<0.001

  Group B (Stim off) −0.27 (−0.39, −0.15) p<0.001 −0.28 (−0.40, −0.17) p<0.001 −0.28 (−0.40, −0.17) p<0.001 −0.40 (−0.53, −0.27) p<0.001 −0.40 (−0.52, −0.28) p<0.001 −0.40 (−0.51, −0.28) p<0.001 −1.61 (−2.12, −1.10) p<0.001 −1.63 (−2.10, −1.16) p<0.001 −1.63 (−2.10, −1.16) p<0.001

 Trt effect: (Diffs in slopes)

  A (on) - B (off) ** −0.14 (−0.31, 0.32) p=0.112 −0.07 (−0.25, 0.11) p=0.449 −0.28 (−0.99, 0.43) p=0.441

period 2

 slope (daily change)

  Group A (Stim off) 0.05 (−0.15, 0.24) p=0.632 0.08 (−0.08, 0.23) p=0.329 0.08 (−0.08, 0.23) p=0.329 −0.01 (−0.20, 0.19) p=0.948 −0.02 (−0.18, 0.14) p=0.839 −0.02 (−0.18, 0.14) p=0.841 −0.29 (−1.04, 0.50) p=0.494 −0.21 (−0.83, 0.42) p=0.514 −0.20 (−0.83, 0.42) p=0.516

  Group B (Stim on) −0.01 (−0.20, 0.18) p=0.899 −0.04 (−0.19, 0.11) p=0.607 −0.04 (−0.19, 0.11) p=0.606 0.34 (−0.17, 0.24) p=0.775 0.04 (−0.12, 0.21) p=0.583 0.04 (−0.12, 0.21) p=0.585 0.19 (−0.60, 0.98) p=0.641 0.12 (−0.51, 0.75) p=0.701 0.12 (−0.51, 0.75) p=0.700

 Trt effect: (Diffs in slopes)

  B (on) - A (off)** −0.06 (−0.33, 0.21) p=0.666 −0.04 (−0.32, 0.24) p=0.775 −0.46 (−1.56, 0.65) p=0.417

Treatment effect difference between periods

 slope diff Pd2 - slope diff Pd1 0.08 (−0.24, 0.40) p=0.616 0.03 (−0.31, 0.36) p=0.866 −0.18 (−1.49, 1.13) p=0.790

Pooled trt effect: −0.12 (−0.26, 0.03) p=0.116 −0.12 (−0.26, 0.03) p=0.116 −0.06 (−0.21, 0.09) p=0.428 −0.06 (−0.21, 0.09) p=0.431 −0.33 (−0.92, 0.26) p=0.277 −0.33 (−0.92, 0.27) p=0.277
1)

Model 1, Full Model: Different Effects of Stimulation by Session, adjusted for age gender ethnicity.

2)

Model 2, Pooled Treatment Effect: Effects of Stimulation are pooled across Sessions, adjusted for age gender ethnicity.

3)

Model 3, Parsimonious Model: Effects of Stimulation are pooled across Sessions, adjusted for age.

4)

Negative values indicate (daily) decreases in Symptoms (Stimulation - No Stimulation).