condition mean min max ZT0-3 6.25301 6.25301 6.25301 ZT4-7 8.33223 8.33223 8.33223 ZT8-11 6.04879 6.04879 6.04879 ZT12-15 4.856165000000001 4.856165000000001 4.856165000000001 ZT16-19 5.33305 5.33305 5.33305 ZT20-23 6.1233233333333335 6.1233233333333335 6.1233233333333335