condition mean min max ZT0-3 26.3685 26.2596 26.477400000000003 ZT4-7 25.8844 25.8844 25.8844 ZT8-11 22.011400000000002 22.011400000000002 22.011400000000002 ZT12-15 0 0 0 ZT16-19 24.2579 24.2579 24.2579 ZT20-23 27.44725 27.44725 27.44725