condition mean min max ZT0-3 12.32055 11.51275 13.128350000000001 ZT4-7 9.396235 9.396235 9.396235 ZT8-11 11.296050000000001 11.296050000000001 11.296050000000001 ZT12-15 0 0 0 ZT16-19 11.92705 11.92705 11.92705 ZT20-23 13.9634 13.9634 13.9634