condition mean min max ZT0-3 4.2695725 3.655695 4.88345 ZT4-7 8.706479999999999 8.706479999999999 8.706479999999999 ZT8-11 8.34458 8.34458 8.34458 ZT12-15 0 0 0 ZT16-19 6.74913 6.74913 6.74913 ZT20-23 10.15929 10.15929 10.15929