condition mean min max ZT0-3 4312.644552 4312.644552 4312.644552 ZT4-7 5575.6885665 5575.6885665 5575.6885665 ZT8-11 4381.5250575 4381.5250575 4381.5250575 ZT12-15 4818.8830895 4818.8830895 4818.8830895 ZT16-19 3461.321774 3461.321774 3461.321774 ZT20-23 2836.2591895 2836.2591895 2836.2591895