condition mean min max ZT0-3 5.5847475 4.145315 7.024179999999999 ZT4-7 2.14796 2.14796 2.14796 ZT8-11 5.05983 5.05983 5.05983 ZT12-15 0 0 0 ZT16-19 5.326405 5.326405 5.326405 ZT20-23 2.93955 2.93955 2.93955