condition mean min max ZT0-3 0.9002673333333334 0.7258100000000001 1.2281300000000002 ZT4-7 1.1531895 1.1531895 1.1531895 ZT8-11 1.72802 1.72802 1.72802 ZT12-15 0.9558325 0.8075414999999999 1.1041235 ZT16-19 1.034465 1.034465 1.034465 ZT20-23 0.6203695 0.6203695 0.6203695