condition mean min max ZT0-3 4.283915 4.283915 4.283915 ZT4-7 17.15415 17.15415 17.15415 ZT8-11 19.8108 19.8108 19.8108 ZT12-15 11.38497 11.38497 11.38497 ZT16-19 12.767700000000001 12.767700000000001 12.767700000000001 ZT20-23 2.49234 2.49234 2.49234