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Table 1 Characteristics of the study sample by observers

From: Indirect calibration between clinical observers - application to the New York Heart Association functional classification system

Observer total 1 2 3 4 5 6 7 8 P
  N (%) N (%) N (%) N (%) N (%) N (%) N (%) N (%) N (%)  
Total 265 (100) 21 (7.7) 61 (22.5) 10 (3.7) 80 (30.4) 21 (7.7) 18 (6.6) 24 (8.9) 28 (10.3) < 0.001
Men 68 (25.7) 7 (33.3) 21 (34.4) 5 (50.0) 14 (17.5) 5 (23.8) 4 (22.2) 7 (29.2) 5 (17.9) 0.180
History of myocardial infarction 19 (7.2) 1 (4.8) 4 (6.6) 1 (10.0) 7 (8.7) 1 (5.0) 0 (0.0) 3 (12.5) 2 (7.1) 0.870
History of angina 32 (12.1) 3 (14.3) 12 (19.2) 1 (10.0) 8 (10.0) 1 (4.8) 1 (5.9) 3 (12.5) 3 (10.7) 0.606
History of heart failure 43 (16.3) 3 (14.3) 13 (21.3) 1 (10.0) 15 (18.8) 1 (4.8) 1 (5.9) 5 (20.8) 4 (14.3) 0.582
Left ventricular systolic dysfunction 18 (7.1) 1 (4.8) 6 (10.2) 0 (0.0) 5 (6.6) 0 (0.0) 0 (0.0) 3 (13.0) 3 (13.0) 0.571
NYHA classification           
I 85 (33.3) 10 (47.6) 26 (43.3) 3 (30.0) 7 (9.3) 10 (58.8) 2 (11.1) 15 (62.5) 12 (42.9) < 0.001
II 147 (57.6) 10 (47.6) 29 (48.3) 5 (50.0) 61 (81.3) 5 (29.4) 15 (83.3) 7 (29.2) 14 (50.0)  
III and IV 23 (9.0) 1 (4.8) 5 (8.3) 2 (20.0) 7 (9.3) 2 (11.8) 1 (5.6) 2 (8.3) 2 (7.1)  
  Mean
(SD)
Mean (SD) Mean (SD) Mean (SD) Mean (SD) Mean (SD) Mean (SD) Mean (SD) Mean (SD)  
Age (years) 65.8 (9.7) 67.5 (9.1) 67.6 (10.3) 66.8 (10.5) 65.6 (9.1) 68.6 (7.9) 62.1 (7.9) 60.0 (8.7) 67.1 (10.3) 0.021
Systolic blood pressure (mmHg) 136 (21) 128 (19) 137 (23) 142 (15) 135 (21) 142 (22) 136 (23) 138 (20) 137 (21) 0.574
Diastolic blood pressure (mmHg) 80 (12) 81 (10) 79 (13) 84 (13) 77 (10) 77 (12) 88 (15) 82 (10) 81 (14) 0.025
Body mass index (kg/m2) 30 (5.5) 31.4 (7.1) 28.7 (4.5) 28.8 (6.3) 29.4 (4.7) 27.9 (4.6) 33.0 (6.1) 32.9 (5.9) 31.2 (6.4) 0.001
  Med (IQR) Med (IQR) Med (IQR) Med (IQR) Med (IQR) Med (IQR) Med (IQR) Med (IQR) Med (IQR)  
Education (years) 4 (5) 4 (4) 4 (3) 7 (7) 4 (5) 4 (7) 5 (3) 4 (6) 4 (0) 0.368
  1. SD: standard deviation
  2. Med: median
  3. IQR: interquartile range.