Table 3.
Full and reduced backward stepwise linear regression analysis model assessing the effect of COVID-19 severity, sociodemographic variables, vaccination status, pandemic wave, chronic conditions and lifestyle on disease duration and the number of clinical symptoms.
| Variable |
The sum of the symptoms during COVID-19 |
The duration of the symptoms (days) during COVID-19 |
||||||
|---|---|---|---|---|---|---|---|---|
| Value | SD | t | p | Value | SD | t | p | |
| Full linear regression analysis model | ||||||||
| COVID-19 Severity | 2.647 | 0.508 | 5.209 | < 0.001 | 6.429 | 1.105 | 5.815 | < 0.001 |
| Age | -0.093 | 0.057 | -1.612 | 0.109 | 0.042 | 0.124 | 0.342 | 0.732 |
| Any sleep disorders | 1.134 | 0.489 | 2.319 | 0.022 | 2.310 | 1.065 | 2.169 | 0.032 |
| Smoking | -0.756 | 0.986 | -0.767 | 0.444 | -1.413 | 2.147 | -0.658 | 0.511 |
| Stress in the last 4 weeks before COVID-19 | 0.152 | 0.640 | 0.238 | 0.812 | 1.133 | 1.137 | 0.998 | 0.321 |
| No regular activity 3 months before COVID | 0.807 | 0.522 | 1.546 | 0.124 | -1.823 | 1.163 | -1.567 | 0.112 |
| Sex, female | 0.807 | 0.514 | 1.569 | 0.119 | -1.701 | 1.120 | -1.519 | 0.131 |
| BMI | 0.075 | 0.052 | 1.501 | 0.135 | -0.004 | 0.124 | -0.0.044 | 0.965 |
| Diabetes Mellitus | 1.009 | 0.652 | 1.547 | 0.124 | 0.098 | 1.419 | 0.069 | 0.944 |
| Coronary Artery Disease | 0.204 | 0.6851 | 0.297 | 0.766 | 0.234 | 1.491 | 0.157 | 0.875 |
| Heart Failure | -1.742 | 2.057 | -0.847 | 0.398 | -4.707 | 4.478 | -1.051 | 0.295 |
| Hypertension | -0.254 | 0.557 | -0.456 | 0.649 | -1.098 | 1.213 | -0.904 | 0.367 |
| COPD | 4.363 | 1.379 | 3.161 | 0.001 | 3.382 | 3.003 | 1.125 | 0.262 |
| Asthma | 0.431 | 0.697 | 0.617 | 0.537 | -0.043 | 1.518 | -0.029 | 0.997 |
| COVID-19 vaccination | 0.058 | 0.534 | 0.109 | 0.912 | -1.823 | 1.162 | -1.567 | 0.112 |
| Pandemic wave | -0.505 | 0.444 | -1.136 | 0.257 | -2.537 | 0.968 | -2.620 | 0.009 |
| Reduced backward stepwise linear regression analysis model | ||||||||
| COVID-19 Severity | 2.712 | 0.474 | 2.919 | 0.004 | 6.368 | 1.005 | 6.334 | < 0.001 |
| Pandemic wave | – | – | – | – | -2.366 | 0.914 | -2.586 | 0.011 |
| Any sleep disorders | 1.532 | 0.467 | 3.318 | 0.001 | – | – | – | – |
| COPD | 3.722 | 1.275 | 2.919 | 0.004 | – | – | – | – |
SD – Standard deviation; BMI – Body Mass Index; COPD – chronic obstructive pulmonary disease. Statistically significant values are in bold with the significance level set at p < 0.05.