condition mean min max ZT0-3 3.32721 3.1302849999999998 3.5241350000000002 ZT4-7 6.009525 6.009525 6.009525 ZT8-11 9.156749999999999 9.156749999999999 9.156749999999999 ZT12-15 0 0 0 ZT16-19 8.27109 8.27109 8.27109 ZT20-23 6.513465 6.513465 6.513465