Many researchers are working to understand risk factors for severe COVID-19 illness - why do some people experience no symptoms, while others end up in the intensive care unit? Age and chronic illness are well-documented risk factors, and research suggests that vitamin D status may also play a role. Answer the following questions using the information in the table below, which show the results of a study that compares risk factors by COVID-19 illness severity. Note that this table shows the means 2 standard deviations; you need to divide the "2SD" values by two to get the standard deviations.

Asymptomatic COVID Critically ill COVID patients (n=91) patients (n=63) P-value Male: female 53:48 42:21 0.03* Age (in years) (mean +2SD) 42.34+6.41 51.41 +9.12 0.01** Weight (in Kg) (Mean + 2SD) 67.18+ 12.34 64.29+11.67 0.09* Height (in meters) (Mean +2SD) 1.12 +0.34 1.10+0.41 0.1* Body Mass Index (Kg/m?) (Mean +2SD) 27.23+3.45 26.83+5.81 0.09* Vitamin D (Serum 25 (OH) D level) in ng/ml (mean +2SD) 27.89 16.21 14.35+5.79