condition mean min max ZT0-3 10.8431625 10.136575 11.54975 ZT4-7 8.908235 8.908235 8.908235 ZT8-11 17.88385 17.88385 17.88385 ZT12-15 0 0 0 ZT16-19 16.1332 16.1332 16.1332 ZT20-23 12.06695 12.06695 12.06695