condition mean min max ZT0-3 3.367975 3.15332 3.58263 ZT4-7 2.649755 2.649755 2.649755 ZT8-11 2.2605500000000003 2.2605500000000003 2.2605500000000003 ZT12-15 0 0 0 ZT16-19 3.024685 3.024685 3.024685 ZT20-23 2.96173 2.96173 2.96173