condition mean min max ZT0-3 28.9912 27.244349999999997 30.73805 ZT4-7 15.46955 15.46955 15.46955 ZT8-11 12.44405 12.44405 12.44405 ZT12-15 0 0 0 ZT16-19 16.6059 16.6059 16.6059 ZT20-23 19.72415 19.72415 19.72415