condition mean min max ZT0-3 26.323075 25.55865 27.0875 ZT4-7 21.6523 21.6523 21.6523 ZT8-11 21.2259 21.2259 21.2259 ZT12-15 0 0 0 ZT16-19 28.54 28.54 28.54 ZT20-23 22.80965 22.80965 22.80965