condition mean min max ZT0-3 56.084975 55.369 56.80095 ZT4-7 47.27365 47.27365 47.27365 ZT8-11 34.677099999999996 34.677099999999996 34.677099999999996 ZT12-15 0 0 0 ZT16-19 52.55675 52.55675 52.55675 ZT20-23 59.87375 59.87375 59.87375