condition mean min max ZT0-3 6.786505 5.088215 7.763555 ZT4-7 6.853289999999999 6.853289999999999 6.853289999999999 ZT8-11 5.21183 5.21183 5.21183 ZT12-15 8.347875 8.12288 8.57287 ZT16-19 8.20072 8.20072 8.20072 ZT20-23 9.871285 9.871285 9.871285