condition mean min max ZT0-3 5.4 5.4 5.4 ZT4-7 29.3 29.3 29.3 ZT8-11 19.0 19.0 19.0 ZT12-15 27.299999999999997 27.299999999999997 27.299999999999997 ZT16-19 16.05 16.05 16.05 ZT20-23 11.3 11.3 11.3