condition mean min max ZT0-3 5.554413333333333 3.305205 8.572659999999999 ZT4-7 2.004607 2.004607 2.004607 ZT8-11 3.41037 3.41037 3.41037 ZT12-15 4.509865 3.3037099999999997 5.71602 ZT16-19 3.51656 3.51656 3.51656 ZT20-23 4.49785 4.49785 4.49785