Table 4.
Analysis of variance (ANOVA) for factors influencing the shedding of microfibers (Duration, washing duration; speed, spin speed; Temp, washing temperature; and fab, jeans types)
| Source | Type III sum of squares | df | Mean square | F | Sig. |
|---|---|---|---|---|---|
| Corrected model | 525407692641103.2a | 275 | 1910573427785 | 531.987 | .000 |
| Intercept | 832817750114045 | 1 | 832817750114045 | 231893.7 | .000 |
| Duration (60, 75, and 90 min) | 780033260034.01 | 2 | 390016630017 | 108.5 | .000 |
| Speed (1200 and 1400 rpm) | 310658235934.9 | 1 | 310658235934.9 | 86.5 | .000 |
| Washing treatments (A-F) | 18238594586469.9 | 5 | 3647718917293.9 | 1015.6 | .000 |
| Temp (30 °C, 45 °C, and 60°C) | 1460583690768.2 | 2 | 730291845384.1 | 203.3 | .000 |
| Fab (jeans-P, jeans-PA, and jeans-PB) | 482541916568759 | 2 | 241270958284379 | 67180.6 | .000 |
| Washing treatments * fab | 19153221115388.4 | 10 | 1915322111538.8 | 533.311 | .000 |
| Speed * washing treatments | 49110020083.1 | 5 | 9822004016.6 | 2.735 | .030 |
| Washing treatments * temp | 239735000390.4 | 10 | 23973500039 | 6.675 | .000 |
| Duration * washing treatments | 95802979982 | 10 | 9580297998.2 | 2.668 | .011 |
| Speed * washing treatments * fab | 169956238685.1 | 12 | 14163019890.4 | 3.944 | .000 |
| Washing treatments * temp * fab | 1318040351635.4 | 12 | 54918347984.8 | 15.2 | .000 |
| Duration * washing treatments * fab | 228483146982.7 | 24 | 9520131124.2 | 2.6 | .002 |
| Speed * washing treatments * temp | 51635799971.8 | 12 | 4302983330.9 | 1.19 | .312 |
| Duration * speed * washing treatments | 148150835645.3 | 12 | 12345902970.4 | 3.43 | .001 |
| Duration * washing treatments * temp | 87219439823.5 | 12 | 3634143325.9 | 1.01 | .471 |
| Speed * washing treatments * temp * fab | 74705070288.9 | 24 | 3112711262 | .867 | .640 |
| Duration * speed * washing treatments * fab | 176525950365.8 | 24 | 7355247931.9 | 2.048 | .017 |
| Duration * washing treatments * temp * fab | 218677099466.7 | 48 | 4555772905.5 | 1.269 | .206 |
| Duration * speed * washing treatments * temp | 64643250429.6 | 24 | 2693468767.9 | .750 | .775 |
| Duration * speed * washing treatments * temp * fab | 1823859458646 | 48 | 390016634455 | .685 | .412 |
| Error | 172386105304.8 | 24 | 3591377193.8 | ||
| Total | 1358397828860285 | 324 | |||
| Corrected Total | 525580078746408 | 323 |
a. R Squared = 1.000 (Adjusted R Squared = .998)