condition mean min max ZT0-3 4.681455 4.405405 4.957504999999999 ZT4-7 5.57263 5.57263 5.57263 ZT8-11 3.0986599999999997 3.0986599999999997 3.0986599999999997 ZT12-15 0 0 0 ZT16-19 5.19917 5.19917 5.19917 ZT20-23 6.71253 6.71253 6.71253