condition mean min max ZT0-3 5.07744 5.07744 5.07744 ZT4-7 3.45877 3.45877 3.45877 ZT8-11 4.963955 4.963955 4.963955 ZT12-15 6.882770000000001 6.882770000000001 6.882770000000001 ZT16-19 8.196110000000001 8.196110000000001 8.196110000000001 ZT20-23 6.63975 6.63975 6.63975