condition mean min max ZT0-3 11.6 11.6 11.6 ZT4-7 29.4 29.4 29.4 ZT8-11 24.200000000000003 24.200000000000003 24.200000000000003 ZT12-15 22.1 22.1 22.1 ZT16-19 23.9 23.9 23.9 ZT20-23 28.849999999999998 28.849999999999998 28.849999999999998