condition mean min max ZT0-3 91.263275 91.263275 91.263275 ZT4-7 139.323511 139.323511 139.323511 ZT8-11 141.5525345 141.5525345 141.5525345 ZT12-15 89.94715049999999 89.94715049999999 89.94715049999999 ZT16-19 79.65072599999999 79.65072599999999 79.65072599999999 ZT20-23 92.63043350000001 92.63043350000001 92.63043350000001