condition mean min max ZT0-3 74.767443 74.767443 74.767443 ZT4-7 65.690081 65.690081 65.690081 ZT8-11 81.9099095 81.9099095 81.9099095 ZT12-15 71.024152 71.024152 71.024152 ZT16-19 54.46533650000001 54.46533650000001 54.46533650000001 ZT20-23 35.213072 35.213072 35.213072