Table 3.

Number of participants reporting symptoms often or sometimes during the last month

Symptom	Yes	No
Tiredness	57	8
Headache	53	12
Dry throat	52	13
Dry eyes	49	16
Throat irritation/hoarseness	49	16
Eye irritation	50	15
Cough	47	18
Nose dry/irritation	47	18
Stuffy nose	46	19
Heavy headiness	44	21
Difficulties to concentrate	37	28