condition mean min max ZT0-3 2.01816 1.9666350000000001 2.0696849999999998 ZT4-7 1.521478 1.521478 1.521478 ZT8-11 3.671165 3.671165 3.671165 ZT12-15 0 0 0 ZT16-19 5.665705 5.665705 5.665705 ZT20-23 3.392255 3.392255 3.392255