condition mean min max ZT0-3 0.41588916666666664 0.32554 0.505425 ZT4-7 0.3079425 0.3079425 0.3079425 ZT8-11 1.7161499999999998 1.7161499999999998 1.7161499999999998 ZT12-15 1.774715 1.280275 2.269155 ZT16-19 1.061374 1.061374 1.061374 ZT20-23 0.474677 0.474677 0.474677