condition mean min max ZT0-3 1.34314 1.34314 1.34314 ZT4-7 1.551815 1.551815 1.551815 ZT8-11 5.22275 5.22275 5.22275 ZT12-15 1.71003 1.71003 1.71003 ZT16-19 1.253175 1.253175 1.253175 ZT20-23 2.05954 2.05954 2.05954