condition mean min max ZT0-3 1.1008841666666667 0.1602015 1.9801950000000001 ZT4-7 0.313511 0.313511 0.313511 ZT8-11 0.329677 0.329677 0.329677 ZT12-15 0.93399075 0.3431565 1.5248249999999999 ZT16-19 0.768505 0.768505 0.768505 ZT20-23 1.400495 1.400495 1.400495