Table 4.

Association between intervention engagement and pain interference outcomes

InterventionPain interference (PROMIS-8a T-score) mean change to 6 monthsEstimate (95% CI) 
0 completed10% completed25% completed50% completed75% completed90% completed100% completed
Proportion of HC sessions within 3 months of enrollment −1.65 −1.89 −2.26 −2.87 −3.48 −3.85 −4.10 −0.024 (−0.059 to 0.010)
P = .17 
Proportion of chatbot lessons completed −1.83 −1.96 −2.15 −2.46 −2.78 −2.96 −3.09 −0.013 (−0.037 to 0.012)
P = .31 
Mean of proportion of HC sessions and chatbot lessons completed −1.51 −1.74 −2.09 −2.68 −3.27 −3.62 −3.85 −0.023 (−0.057 to 0.010)
P = .17 
InterventionPain interference (PROMIS-8a T-score) mean change to 6 monthsEstimate (95% CI) 
0 completed10% completed25% completed50% completed75% completed90% completed100% completed
Proportion of HC sessions within 3 months of enrollment −1.65 −1.89 −2.26 −2.87 −3.48 −3.85 −4.10 −0.024 (−0.059 to 0.010)
P = .17 
Proportion of chatbot lessons completed −1.83 −1.96 −2.15 −2.46 −2.78 −2.96 −3.09 −0.013 (−0.037 to 0.012)
P = .31 
Mean of proportion of HC sessions and chatbot lessons completed −1.51 −1.74 −2.09 −2.68 −3.27 −3.62 −3.85 −0.023 (−0.057 to 0.010)
P = .17 

For each % increase in intervention completed, estimated decline in pain interference at 6 months.

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