condition mean min max ZT0-3 16.166600000000003 16.166600000000003 16.166600000000003 ZT4-7 9.575225 9.575225 9.575225 ZT8-11 10.982700000000001 10.982700000000001 10.982700000000001 ZT12-15 10.96145 10.96145 10.96145 ZT16-19 25.5413 25.5413 25.5413 ZT20-23 20.088 20.088 20.088