condition mean min max ZT0-3 400.411578 400.411578 400.411578 ZT4-7 148.997308 148.997308 148.997308 ZT8-11 140.30353350000001 140.30353350000001 140.30353350000001 ZT12-15 113.9754355 113.9754355 113.9754355 ZT16-19 33.2672005 33.2672005 33.2672005 ZT20-23 38.581531 38.581531 38.581531