condition mean min max ZT0-3 12.850158 12.850158 12.850158 ZT4-7 12.5572315 12.5572315 12.5572315 ZT8-11 13.662130000000001 13.662130000000001 13.662130000000001 ZT12-15 12.488268000000001 12.488268000000001 12.488268000000001 ZT16-19 12.674799499999999 12.674799499999999 12.674799499999999 ZT20-23 12.147231999999999 12.147231999999999 12.147231999999999