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Table 6 Comparison of sociodemographic, clinical and outcome parameters among patients with arterial blood gases data available at decision making versus those with missing data at that time.

From: The IRYSS-COPD appropriateness study: objectives, methodology, and description of the prospective cohort

  Patients without missing data
N = 747
Patients with missing data
N = 2130
p value
Age* 72.54 (9.50) 72.94 (9.51) 0.3311
Clinical data previous to arrival at the ED    
Charlson Index    0.5522
   <=1 301 (40.68) 883 (41.93)  
   >1 439 (59.32) 1223 (58.07)  
Number of hospital admissions in the previous 12 months for COPD    <.0001
   3 or more 128 (17.34) 232 (11.04)  
   Less than 3 610 (82.66) 1869 (88.96)  
Basal FEV1%    <.0001
   >= 50 169 (25.61) 640 (36.16)  
   < 50 491 (74.39) 1130 (63.84)  
Use of oxygen at home - Yes 336 (45.41) 648 (30.84) <.0001
At arrival at the ED    
Glasgow Coma Scale - altered 34 (4.55) 43 (2.02) 0.0002
Edema - Yes 153 (21.37) 363 (18.19) 0.0627
Dyspnea upon arrival in the ED - Yes 546 (76.36) 1288 (63.64) <.0001
PH at arrival    <.0001
   >=7.35 462 (69.79) 1679 (91.65)  
   7.26-7.35 156 (23.56) 137 (7.48)  
   <7.26 44 (6.65) 16 (0.87)  
PO2 at arrival    <.0001
   >60 229 (35.12) 901 (49.59)  
   45 - 60 273 (41.87) 706 (38.86)  
   <=45 150 (23.01) 210 (11.56)  
Respiratory rate at arrival    <.0001
   <20 79 (12.38) 356 (21.24)  
   20-24 209 (32.76) 623 (37.17)  
   >24 350 (54.86) 697 (41.59)  
PCO2 at arrival    <.0001
   <=45 243 (36.82) 1122 (61.48)  
   46-55 165 (25.00) 427 (23.40)  
   56-65 117 (17.73) 171 (9.37)  
   >65 135 (20.45) 105 (5.75)  
Outcome parameters    
Death 18 (2.41) 42 (1.97) 0.4712
Admission to Intensive Care Unit 14 (1.87) 13 (0.61) 0.0021
Invasive Mechanical Ventilation 16 (2.14) 22 (1.03) 0.0223
Admission to Intermediate respiratory care unit 50 (6.69) 24 (1.13) <.0001
Noninvasive mechanical ventilation 57 (7.63) 43 (2.02) <.0001
Chronic oxygen therapy in the medical ward 476 (63.72) 1036 (48.64) <.0001
Cardiac arrest 6 (0.80) 14 (0.66) 0.6796
  1. *Mean (Std)
  2. Patients were included in the patients with missing data at decision making time group if they did not have the pH data available at that time. If they had it, they were included in the group with no missing data at that time.