Average PEFR (Equation 1 and PEFR) L/min
r = +0.06        p = 0.611
(a)

Average PEFR (Equation 2 and PEFR) L/min
r = –0.77         p = < 0.001
(b)

Average PEFR (Equation 3 and PEFR) l/min
r = –0.77           p = <0.001
(c)

Average PEFR (Equation 4 and PEFR) L/min
r = – 0.59              p = < 0.001
(d)

Average PEFR (Equation 5 and PEFR) L/min
r = –0.95           p = <0.001
(e)

Average PEFR (Equation 6 and PEFR) L/min
r = –0.88       p = <0.001
( f )

Average PEFR (Equation 7 and PEFR) L/min
r = –0.96          p = <0.001
( g)

Average PEFR (Equation 8 and PEFR) L/min
r = –0.61 p = <0.001
( h)

Average PEFR (Equation 9 and PEFR) L/min
r = –0.34            p = 0.002
(i)

Average PEFR (Equation 10 and PEFR) L/min
r = +0.18       p = 0.102
( j )

Average PEFR (Equation 12 and PEFR) L/min
r = –0.57        p = <0.001
(k)

Average PEFR (Equation 14 and PEFR) L/min
r = –0.56 p = <0.001
(m)

Average PEFR (Equation 15 and PEFR) L/min
r = –0.37 p = <0.001
(n)

Average PEFR (Equation 16 and PEFR) L/min
r = –0.70 p = <0.001
(o)

Average PEFR (Equation 17 and PEFR)L/min
r = –0.35 p = <0.002
(p)

Average PEFR (Equation 18 and PEFR) L/min
r = +0.12 p = 0.279
(q)

Fig. 1. Bland-Altman plots for difference against mean PEFR in boys.