condition mean min max ZT0-3 72.654358 72.654358 72.654358 ZT4-7 67.00024450000001 67.00024450000001 67.00024450000001 ZT8-11 79.367397 79.367397 79.367397 ZT12-15 88.7637365 88.7637365 88.7637365 ZT16-19 84.69623999999999 84.69623999999999 84.69623999999999 ZT20-23 77.57493 77.57493 77.57493