condition mean min max ZT0-3 1.6041699999999999 1.6041699999999999 1.6041699999999999 ZT4-7 1.40894 1.40894 1.40894 ZT8-11 1.47511 1.47511 1.47511 ZT12-15 1.7649949999999999 1.7649949999999999 1.7649949999999999 ZT16-19 0.7228975 0.7228975 0.7228975 ZT20-23 1.25583 1.25583 1.25583