condition mean min max ZT0-3 7.8690025 7.47359 8.264415 ZT4-7 5.46058 5.46058 5.46058 ZT8-11 4.054415 4.054415 4.054415 ZT12-15 0 0 0 ZT16-19 5.429045 5.429045 5.429045 ZT20-23 6.221550000000001 6.221550000000001 6.221550000000001