Table 1 Normality test statistics and their P values for response variables
Test | Nasal air flow (L) | Nasal air flow (R) | NO (L) | NO (R) | CO (L) | CO (R) | Exhaled NO | Exhaled CO | Tenderness (L) before suction | Tenderness (L) after suction | Tenderness (R) before suction | Tenderness (R) after suction | General Headache before suction | General Headache after suction |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Shapiro–Wilk | 0.8726 (P < 0.01) | 0.8475 (P < 0.01) | 0.8047 (P < 0.01) | 0.7473 (P < 0.01) | 0.7120 (P < 0.01) | 0.7528 (P < 0.01) | 0.9470 (P = 0.05) | 0.4107 (P < 0.01) | 0.8253 (P < 0.01) | 0.8644 (P < 0.01) | 0.4884 (P < 0.01) | 0.7570 (P < 0.01) | 0.796 (P < 0.01)5 | 0.7980 (P < 0.01) |
Kolmogorov–Smirnov | 0.2558 (P < 0.01) | 0.2487 (P < 0.01) | 0.2361 (P < 0.01) | 0.2566 (P < 0.01) | 0.3546 (P < 0.01) | 0.3308 (P < 0.01) | 0.1149 (P = 0.15) | 0.4498 (P < 0.01) | 0.1906 (P = 0.06) | 0.2732 (P < 0.01) | 0.4520 (P < 0.01) | 0.3755 (P < 0.01) | 0.3319 (P < 0.01) | 0.2885 (P < 0.01) |
Cramer–von Mises | 0.4120 (P < 0.01) | 0.4441 (PP < 0.01) | 0.4963 (P < 0.01) | 0.4572 (P < 0.01) | 0.8670 (P < 0.01) | 0.7601 (P < 0.01) | 0.1029 (P = 0.10) | 2.0197 (P < 0.01) | 0.1723 (P = 0.01) | 0.2590 (P < 0.01) | 0.9330 (P < 0.01) | 0.4876 (P < 0.01) | 0.4146 (P < 0.01) | 0.3464 (P < 0.01) |
Anderson–Darling | 2.2138 (P < 0.01) | 2.5461 (P < 0.01) | 2.8745 (P < 0.01) | 2.8681 (P < 0.01) | 5.2708 (P < 0.01) | 4.4358 (P < 0.01) | 0.71250 (P < 0.01) | 9.9064 (P < 0.01) | 1.2480 (P < 0.01) | 1.3202 (P < 0.01) | 4.5063 (P < 0.01) | 2.5093 (P < 0.01) | 2.0666 (P < 0.01) | 1.8707 (P < 0.01) |
N | 41 | 42 | 42 | 42 | 42 | 42 | 42 | 42 | 20 | 20 | 20 | 20 | 20 | 20 |