condition mean min max ZT0-3 75.03710765999999 55.18141046 94.89280485999998 ZT4-7 90.35748843500001 89.6081522 91.10682467000001 ZT8-11 45.208257135 32.94789225 57.46862202 ZT12-15 8.077129767499999 7.6117159535 8.542543581499999 ZT16-19 18.5471897525 14.844477875 22.24990163 ZT20-23 30.6668312625 25.75855722 35.575105305