Total (n=757) < 85 years (n=618) ≥ 85 years (n=139) P
Department of admission        
PNE 527(70%) 445(72.2%) 82(59.9%) 0.003
IM 218(29%) 163(26.5%) 55(40.1%)  
Mean stay (SD) 12.3(9.12) 12.4(9.5) 11.6(7.1) NS
ICU 27(3.6%) 26(4.2%) 1(0.7%) 0.045
Season       NS
Spring 199(26.3%) 158(25.6%) 41(29.5%)  
Summer 116(15.3%) 94(15.2%) 22(23%)  
Fall 141(18.6%) 109(17.6%) 32(23%)  
Winter 301(39.8%) 257(41.6%) 44(31.7%)  
Reason for consultation       0.015
Dyspnea 642(84.8%) 530(85.9%) 112(80.6%)  
Temperature 31(4.1%) 28(4.5%) 3(2.2%)  
Coughing 13(1.7%) 12(1.9%) 1(0.7%)  
Symptoms        
Dyspnea 712(94,1%) 585(94,7%) 127(91,4%) NS
Coughing 564(74,5%) 460(74,4%) 104(74,8%) NS
Increased sputum amount 452(59,7%) 368(59,5%) 84(60,4%) NS
Sputum purulence 261(34,5%) 215(34,8%) 46(33,1%) NS
Temperature 231(30,5%) 194(31,4%) 37(26,6%) NS
Hemoptysis 36(4,8%) 29(4,7%) 7(5%) NS
Exacerbation (Anthonisen)       NS
Type 1 245(32.4%) 200(32.4%) 45(32.4%)  
Type 2 206(27.2%) 169(27.3%) 37(26.6%)  
Type 3 278(36.7%) 230(37.2%) 48(34.5%)  
Vital signs (SD)        
T (C) 36.9(0.94) 36.9(0.96) 36.8(0.85) NS
Respiratory rate 23(6.4) 23(6.5) 20(5) 0.018
SBP (mmHg) 131(24.1) 131(24) 132(24.3) NS
DBP (mmHg) 74(13.5) 74.7(13.4) 70.7(13.2) 0.001
Laboratory data (SD)        
Hemoglobin (g/dl) 13.5(2.2) 13.6(2.2) 13.1(1.9) 0.015
Hematocrit (%) 40 (6.7) 40.2(6.8) 39.2(5.8) NS
Leukocytes (106/L) 12 160(9424.3) 11 993(9273) 12 880(10 068) NS
Platelets (106/L) 249 514(104 336) 249 243(107 745) 250 717(87 944) NS
Fibrinogen (mg/dl) 454(152.7) 450(159) 468(127) NS
Glycemia (mg/dl) 143(67.7) 142(68) 143(62) NS
Urea (mg/dl) 68.4(38) 56.5(31.2) 77.2(44.5) < 0.0001
Creatinine (mg/dl) 1.15(0.7) 1.14(0.7) 1.4(0.7) 0.001
PaO2 (mmHg) 58(19.1) 59(20.2) 55(13) 0.049
PaCO2 (mmHg) 47.7(15.3) 46.9(15.8) 45.6(12.7) NS
Early readmission 44(5.8%) 34(5.6%) 10(7.4%) NS
Hospital mortality 36(4.8%) 25(4%) 11(7.9%) 0.053
Table 2: Characteristics of the acute exacerbation