condition mean min max ZT0-3 47.6701 44.567099999999996 50.7731 ZT4-7 50.20725 50.20725 50.20725 ZT8-11 47.9555 47.9555 47.9555 ZT12-15 0 0 0 ZT16-19 49.95285 49.95285 49.95285 ZT20-23 47.44795 47.44795 47.44795