condition mean min max ZT0-3 35.137883 35.137883 35.137883 ZT4-7 31.1984225 31.1984225 31.1984225 ZT8-11 33.874497 33.874497 33.874497 ZT12-15 33.1400465 33.1400465 33.1400465 ZT16-19 44.627067 44.627067 44.627067 ZT20-23 43.319423 43.319423 43.319423