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Table 3 Results for Length of Stay (LOS): Crude Odds Ratios (p value from Cochran Mantel Haenszel Chi Square Test of Zero Correlation) and Adjusted Odds Ratios from Multivariate Logistic Regression (p value from partial test on regression coefficient)

From: Effect of osteopathic manipulative treatment on gastrointestinal function and length of stay of preterm infants: an exploratory study

  LOS (days) Univariate O.R. Adjusted O.R.
  < 28 ≥ 28 O.R. (95%CI) p > |χ2 O.R. (95%CI) p > |χ2
N 267 (76.3) 83 (23.7)     
Gender       
   Females [R.C] 128 (75.3) 42 (24.7) 1 - 1 -
   Males 139 (77.2) 41 (22.8) 0.90 (0.55-1.47) 0.765 1.40 (0.63-3.10) 0.412
Gestational Age       
   ≤ 32 21 (25.6) 61 (74.4) 38.10 (16.40-88.20) < 0.001 10.90 (3.53-33.72) < 0.001
   > 32, ≤ 35 128 (90.8) 13 (9.2) 1.33 (0.55-3.22) 0.680 0.76 (0.27-2.15) 0.609
   > 35 [R.C] 118 (92.9) 9 (7.1) 1 -   
Birth Weight (grams)       
   ≤ 1700 9 (15.5) 49 (84.5) 120.60 (42.70-340.60) < 0.001 43.23 (11.63-160.66) < 0.001
   > 1700, ≤ 2200 103 (79.2) 27 (20.8) 5.80 (2.40-13.80) < 0.001 3.01 (1.05-8.68) 0.041
   > 2200 [R.C] 155 (95.7) 7 (4.3) 1 - 1 -
Oral feeding at admission       
   No 186 (72.1) 72 (27.9) 2.85 (1.44-5.66) 0.003 3.11 (1.05-9.25) 0.041
   Yes [R.C] 81 (88.0) 11 (12.0) 1 - 1 -
OMT       
   No [R.C] 133 (70.7) 55 (29.3) 1 - 1 -
   Yes 134 (82.7) 28 (17.3) 0.51 (0.30-0.85) 0.012 0.22 (0.09-0.51) < 0.001
  1. R.C. = Reference Category