condition mean min max ZT0-3 28.209025 25.36925 31.0488 ZT4-7 16.3235 16.3235 16.3235 ZT8-11 17.893900000000002 17.893900000000002 17.893900000000002 ZT12-15 0 0 0 ZT16-19 34.96645 34.96645 34.96645 ZT20-23 30.832250000000002 30.832250000000002 30.832250000000002