condition mean min max ZT0-3 4.4692 3.347925 5.590475 ZT4-7 5.62224 5.62224 5.62224 ZT8-11 6.723985 6.723985 6.723985 ZT12-15 0 0 0 ZT16-19 6.919684999999999 6.919684999999999 6.919684999999999 ZT20-23 5.7384699999999995 5.7384699999999995 5.7384699999999995