condition mean min max ZT0-3 63.138288 63.138288 63.138288 ZT4-7 75.6355355 75.6355355 75.6355355 ZT8-11 78.7325155 78.7325155 78.7325155 ZT12-15 73.775697 73.775697 73.775697 ZT16-19 88.6339445 88.6339445 88.6339445 ZT20-23 103.212603 103.212603 103.212603