condition mean min max ZT0-3 3.6611061666666664 0.9623785 7.90123 ZT4-7 23.000500000000002 23.000500000000002 23.000500000000002 ZT8-11 63.57665 63.57665 63.57665 ZT12-15 41.3979 22.33645 60.45935 ZT16-19 14.5169 14.5169 14.5169 ZT20-23 6.93922 6.93922 6.93922