condition mean min max ZT0-3 11.05 11.05 11.05 ZT4-7 7.1 7.1 7.1 ZT8-11 8.299999999999999 8.299999999999999 8.299999999999999 ZT12-15 29.2 29.2 29.2 ZT16-19 11.3 11.3 11.3 ZT20-23 28.0 28.0 28.0