condition mean min max ZT0-3 3.47739196975 1.9170970090000001 5.0376869305000005 ZT4-7 10.05438099125 9.179660972499999 10.92910101 ZT8-11 17.790733222500002 14.49474742 21.086719025 ZT12-15 73.6423330675 69.85141339 77.433252745 ZT16-19 79.4557464975 73.689161205 85.22233179 ZT20-23 53.958974665 47.65973918 60.25821015