condition mean min max ZT0-3 2.2411416666666666 1.6682350000000001 2.753525 ZT4-7 0.7768235 0.7768235 0.7768235 ZT8-11 0.21442 0.21442 0.21442 ZT12-15 0.53066625 0.3544755 0.7068570000000001 ZT16-19 0.3571045 0.3571045 0.3571045 ZT20-23 0.6191095 0.6191095 0.6191095