condition mean min max ZT0-3 4.81943 4.22598 5.4128799999999995 ZT4-7 4.160385 4.160385 4.160385 ZT8-11 4.43358 4.43358 4.43358 ZT12-15 0 0 0 ZT16-19 5.520045 5.520045 5.520045 ZT20-23 7.0769649999999995 7.0769649999999995 7.0769649999999995