condition mean min max ZT0-3 1.2065215 1.124625 1.288418 ZT4-7 1.40823 1.40823 1.40823 ZT8-11 1.8252249999999999 1.8252249999999999 1.8252249999999999 ZT12-15 0 0 0 ZT16-19 2.3423350000000003 2.3423350000000003 2.3423350000000003 ZT20-23 2.00807 2.00807 2.00807