condition mean min max ZT0-3 16.23005 16.23005 16.23005 ZT4-7 16.2215 16.2215 16.2215 ZT8-11 19.36105 19.36105 19.36105 ZT12-15 23.422150000000002 23.422150000000002 23.422150000000002 ZT16-19 26.964799999999997 26.964799999999997 26.964799999999997 ZT20-23 14.30045 14.30045 14.30045