condition mean min max ZT0-3 175.049308 175.049308 175.049308 ZT4-7 237.265153 237.265153 237.265153 ZT8-11 165.593452 165.593452 165.593452 ZT12-15 190.768079 190.768079 190.768079 ZT16-19 91.2816275 91.2816275 91.2816275 ZT20-23 43.4877875 43.4877875 43.4877875