condition mean min max ZT0-3 22.546 21.95995 23.13205 ZT4-7 16.34415 16.34415 16.34415 ZT8-11 16.50775 16.50775 16.50775 ZT12-15 0 0 0 ZT16-19 26.4203 26.4203 26.4203 ZT20-23 27.0811 27.0811 27.0811