| CFS subjects | Healthy subjects | CFS positive control subjects | |||||||
---|---|---|---|---|---|---|---|---|---|---|
 | XMRV Positive (n = 5) | XMRV Negative (n = 67) | Total (n = 72)1 | XMRV Positive (n = 2) | XMRV Negative (n = 35) | Total (n = 37)1 | XMRV Positive (n = 1) | XMRV Negative (n = 19) | Total (n = 20)1 | |
Age ( years ), Mean ( STDEV ) | 50.4 (4.3) | 49.4 (12.0) | 49.5 (11.6) | 30.0 (17.0) | 47.6 (14.3) | 46.6 (14.8) | 28 | 51.4 (12.5) | 50.0 (13.3) | |
Age of first CFS symptoms ( years ), Mean ( STDEV ) | 30.6 (13.2) | 34.8 (11.4) | 34.5 (11.5) | NA | NA | NA | 22 | 34.3 (12.3) | 33.5 (12.2) | |
Age of CFS diagnosis ( years ), Mean ( STDEV ) | 37.2 (11.3) | 38.4 (11.3) | 38.3 (11.2) | NA | NA | NA | 24 | 37.1 (9.7) | 36.3 (10.0) | |
Sex, n (%) | Female | 4 (80) | 51 (76) | 55 (76) | 2 (100) | 29 (83) | 31 (84) | 1 (100) | 9 (47) | 10 (50) |
 | Male | 1 (20) | 15 (22) | 16 (22) | 0 | 5 (14) | 5 (14) | 0 | 7 (37) | 7 (35) |
 | Missing data | 0 | 1 (1) | 1 (1) | 0 | 1 (3) | 1 (3) | 0 | 3 (16) | 3 (15) |
BMI ( kg / m 2 ) Mean ( STDEV ) | 26.2 (5.5) | 25.9 (6.0) | 25.9 (6.0) | 21.2 (2.3) | 25.6 (6.0) | 25.3 (5.9) | 18.6 | 24.6 (4.6) | 24.2 (4.7) | |
Race, n (%) | Caucasian | 5 (100) | 66 (99) | 71 (99) | 2 (100) | 33 (94) | 35 (95) | 1 (100) | 15 (79) | 16 (80) |
 | Non-Caucasian | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 (5) | 1 (5) |
 | Missing data | 0 | 1 (1) | 1 (1) | 0 | 2 (6) | 2 (5) | 0 | 3 (16) | 3 (15) |
CFS Onset , n (%) | Gradual | 2 (40) | 16 (24) | 18 (25) | NA | NA | NA | 0 | 8 (42) | 8 (40) |
 | Sudden | 3 (60) | 50 (75) | 53 (74) | NA | NA | NA | 1 | 8 (42) | 9 (45) |
 | Missing data | 0 | 1 (1) | 1 (1) | NA | NA | NA | 0 | 3 (16) | 3 (15) |
RAND-36 Physical Health Mean ( STDEV ) | Physical functioning | 20.0 (14.6) | 36.3 (21.1) | 35.1 (21.1) | 1002 | 85.0 (30.2) | 85.4 (29.8) | 5 | 40.0 (28.3) | 38.3 (28.6) |
 | Role-physical | 20.0 (44.7) | 2.3 (8.5) | 3.5 (14.2) | 50 | 90.7 (28.5) | 89.6 (28.9) | 0 | 1.3 (5.7) | 1.3 (5.6) |
 | Bodily pain | 48.0 (22.3) | 47.7 (25.1) | 47.7 (24.8) | 90 | 84.4 (28.3) | 84.6 (27.9) | 30 | 43.8 (24.8) | 43.1 (24.3) |
 | General health | 24.0 (4.2) | 24.9 (16.3) | 24.9 (15.8) | 90 | 76.1 (21.2) | 76.5 (21.0) | 10 | 15.3 (14.3) | 15.0 (14.0) |
RAND-36 Mental Health Mean ( STDEV ) | Vitality | 12.0 (10.4) | 14.7 (13.7) | 14.5 (13.4) | 55 | 68.6 (24.8) | 68.2 (24.6) | 10 | 17.9 (18.4) | 17.5 (18.0) |
 | Social functioning | 24.5 (14.5) | 28.4 (22.2) | 28.1 (21.7) | 100 | 87.2 (26.7) | 87.6 (26.4) | 0 | 27.5 (28.1) | 26.1 (28.0) |
 | Role emotional | 86.7 (29.8) | 67.2 (44.7) | 68.5 (44.0) | 100 | 86.7 (29.4) | 87.0 (29.0) | 100 | 56.1 (44.5) | 58.3 (44.4) |
 | Mental health | 67.2 (10.0) | 60.7 (16.9) | 61.2 (16.6) | 68 | 76.1 (26.3) | 75.9 (25.9) | 64 | 53.5 (27.0) | 54.0 (26.4) |
Clinical Site , n (%) | Florida | 0 | 6 (9) | 6 (8) | 0 | 14 (40) | 14 (38) | 0 | 0 | 0 |
 | North Carolina | 4 (80) | 16 (24) | 20 (28) | 2 (100) | 7 (20) | 9 (24) | 0 | 0 | 0 |
 | Pennsylvania | 0 | 1 (1) | 1 (1) | 0 | 0 | 0 | 0 | 0 | 0 |
 | Nevada | 0 | 0 | 0 | 0 | 0 | 0 | 1 (100) | 19 (100) | 20 (100) |
 | Utah | 1 (20) | 44 (66) | 45 (63) | 0 | 14 (40) | 14 (38) | 0 | 0 | 0 |