very close to significanceP = 0.058
In addition to that, the diurnal variation difference of FEV 1 and FEV 3 in different age-groups was very close to significance ( P = 0.058 for FEV 1 and = 0.053 for FEV 3 ), indicating diurnal variation of these two variables increased with age, especially for the 45- to 60-year population.