condition mean min max ZT0-3 1.1022475 1.1022475 1.1022475 ZT4-7 1.310797 1.310797 1.310797 ZT8-11 0.793428 0.793428 0.793428 ZT12-15 0.6932355 0.6932355 0.6932355 ZT16-19 0.688412 0.688412 0.688412 ZT20-23 0.9261364999999999 0.9261364999999999 0.9261364999999999