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. 2008 Jul 12;1(3):267–273.

Figure 1.

Figure 1

Diurnal changes in PFTs. Results from spirometry tests conducted between 8:00 am and 5:00 pm were analyzed. Tests in the following time intervals were analyzed: 8:00–8:59 am (8 am); 9:00–9:59 am (9 am); 10:00–10:59 (10 am); 11:00–11:59 am (11 am); 12:00–12:59 pm (12 pm); 1:00–1:59 pm (1pm); 2:00–2:59 pm (2 pm); 3:00–3:59 pm (3 pm); and 4:00–4:59 pm (4 pm). The asterisk notes the difference between the lowest and the highest value. For complete statistical analysis please refer to Table 2. (A) Variations in FEV1 (*P<0.01 as compared with 4 pm). (B) Variations in FVC (*P<0.05 as compared with 4 pm). (C) Variations in the peak expiratory flow (PEF) (*P<0.05 as compared with 3 pm). (D) Variations in the FEV1/FVC ratio (*P<0.001 as compared with 3 pm). Data are presented as mean ± SEM.