condition mean min max ZT0-3 3.5488583333333334 2.28273 4.432475 ZT4-7 4.349615 4.349615 4.349615 ZT8-11 8.200475 8.200475 8.200475 ZT12-15 10.338065 9.28888 11.38725 ZT16-19 6.881285 6.881285 6.881285 ZT20-23 8.722385 8.722385 8.722385