condition mean min max ZT0-3 0.4073036666666667 0.1996925 0.6497575 ZT4-7 0.4454395 0.4454395 0.4454395 ZT8-11 1.1925845 1.1925845 1.1925845 ZT12-15 0.86750325 0.7564295 0.978577 ZT16-19 0.6112685 0.6112685 0.6112685 ZT20-23 0.8860075000000001 0.8860075000000001 0.8860075000000001