condition mean min max ZT0-3 59.592517 59.592517 59.592517 ZT4-7 68.6819715 68.6819715 68.6819715 ZT8-11 80.955915 80.955915 80.955915 ZT12-15 77.3504885 77.3504885 77.3504885 ZT16-19 80.570561 80.570561 80.570561 ZT20-23 90.9920235 90.9920235 90.9920235