Sound pressure (mPa) in directions i–vi | ||||||||
---|---|---|---|---|---|---|---|---|
Distance (mm) | (i) | (ii) | (iii) | (iv) | (v) | (vi) | F_{5,55} | P |
5 | 323.0 ^{a} | 267.4^{a,b} | 302.7^{a,b} | 246.7^{b,c} | 215.8^{c} | 236.0^{b,c} | 6.25 | <0.001 |
10 | 207.1 ^{a} | 190.6^{a,b} | 199.1^{a} | 189.1^{a,b} | 180.2^{a,b} | 151.0^{b} | 3.49 | 0.008 |
15 | 152.0^{a,b} | 169.6^{a} | 169.9 ^{a} | 154.8^{a,b} | 120.9^{b} | 124.2^{b} | 6.51 | <0.001 |
20 | 146.2 ^{a} | 135.6^{a} | 142.2^{a} | 127.7^{a,b} | 106.4^{b,c} | 97.5^{c} | 8.94 | <0.001 |
See Fig. 1B for details on directions i–iv
Bold letters emphasize highest measured values at the given distance
Sound pressures measured at same distances (⩾5 mm) but in different directions were compared using one-way repeated measures ANOVA (F-values given). Level for significance of difference is P_{corr.}⩽0.025. Values in a row that have same superscript letters did not differ significantly from each other (pairwise comparison: Tukey-test, P>0.05)