condition mean min max ZT0-3 11.0 11.0 11.0 ZT4-7 22.9 22.9 22.9 ZT8-11 33.65 33.65 33.65 ZT12-15 21.450000000000003 21.450000000000003 21.450000000000003 ZT16-19 10.2 10.2 10.2 ZT20-23 10.299999999999999 10.299999999999999 10.299999999999999