Figure 1From: Macrorheology of cystic fibrosis, chronic obstructive pulmonary disease & normal sputum Box and whisker plot comparing mucoid, mucopurulent and purulent sputum from CF subjects for storage modulus. (Illustrating the graded increase in elasticity measures at 9 Hz occurring with increasing macroscopic purulence of sputum from stable CF subjects. Mucoid n = 4, mucopurulent n = 10, purulent n = 8. * by Mann-Whitney U-test).Back to article page