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. Author manuscript; available in PMC: 2017 Sep 10.
Published in final edited form as: Stat Med. 2016 Mar 21;35(20):3537–3548. doi: 10.1002/sim.6943

Table 4.

Baseline Distribution for Post-Surgery Pain Data

Nerve Block
Anesthesia
N Mean SE N Mean SE
Age (year) 4806 57.06 15.81 1705 53.55 16.88
BMI 4806 29.00 6.98 1705 28.41 7.04
Surgery Duration (hour) 4806 3.87 2.08 1705 3.18 2.01
Nerve Block
Anesthesia
N Proportion N Proportion
Gender
 Male 2356 0.490 871 0.511
 Female 2450 0.510 834 0.489
ICD9 Comorbidity Count
 < 5 1194 0.248 411 0.241
 5 ~ 9 1643 0.342 566 0.332
 10 ~ 19 1549 0.322 596 0.350
 ≥ 20 420 0.087 132 0.077
Ethnic Group
 H 118 0.025 62 0.036
 N 4474 0.931 1592 0.934
 U 214 0.044 51 0.030