condition mean min max ZT0-3 9.909363678583334 9.469453332666667 10.349274024500001 ZT4-7 9.366479862333332 9.15396386 9.578995864666666 ZT8-11 10.2316180205 9.723400247999999 10.739835793 ZT12-15 10.8146746985 10.748920077 10.880429320000001 ZT16-19 11.606636811666666 11.351296816666666 11.861976806666666 ZT20-23 9.511273619 9.403423443 9.619123795