condition mean min max ZT0-3 1.151955 1.02894 1.27497 ZT4-7 1.526275 1.526275 1.526275 ZT8-11 2.2390600000000003 2.2390600000000003 2.2390600000000003 ZT12-15 0 0 0 ZT16-19 2.02391 2.02391 2.02391 ZT20-23 1.902835 1.902835 1.902835