Table 4.
Frequency of SpO2 decrease and associations to changes from baseline characteristics
| Total (n) | SpO2 decrease (n) | (%) | P-value | |
|---|---|---|---|---|
| 2,822 | 139 | (4.9) | ||
| Self-reported diseases, new | ||||
| CVD | 225 | 7 | (3.1) | 0.2 |
| Asthma | 104 | 14 | (13.5) | <0.001 |
| COPD | 117 | 16 | (13.7) | <0.001 |
| Diabetes | 113 | 10 | (8.8) | 0.049 |
| Hypertension | 512 | 28 | (5.5) | 0.5 |
| Smoking history T5–T6 | 0.3 | |||
| Quit smoking | 266 | 14 | (5.3) | |
| Continued smoking | 399 | 30 | (7.5) | |
| BMI (kg/m2) | ||||
| All | 0.09 | |||
| ≥2↑ | 302 | 22 | (7.3) | |
| 2↑–2↓ | 2,201 | 106 | (4.8) | |
| ≥2↓ | 309 | 11 | (3.6) | |
| ≥30 | 0.1 | |||
| ≥2↑ | 60 | 7 | (11.5) | |
| 2↑–2↓ | 407 | 29 | (7.1) | |
| ≥2↓ | 115 | 4 | (3.5) | |
| FEV1 % predicted/yeara | ||||
| ≥2↓ | 168 | 18 | (10.7) | <0.001 |
| CRP (mg/L) | ||||
| ≥5↑ | 142 | 13 | (9.2) | 0.020 |
| Fibrinogen (g/L) | ||||
| ≥1↑ | 593 | 33 | (5.6) | 0.6 |
| Uric acid (μmol/L) | ||||
| ≥60↑ | 293 | 15 | (5.1) | 0.9 |
| Albumin:creatinine ratio (mg/mmol) | ||||
| ≥3↑ | 142 | 8 | (5.6) | 0.7 |
Notes:
a
Decrease divided by years between examinations. Upward arrows indicate an increase, downward arrows indicate a decrease.
Abbreviations: BMI, body mass index; COPD, chronic obstructive pulmonary disease; CRP, C-reactive protein; CVD, cardiovascular disease; FEV1, forced expiratory volume in 1 second; SpO2, arterial oxygen saturation as measured by pulse oximetry; T5, Tromsø 5; T6, Tromsø 6.