condition mean min max ZT0-3 40.72066429 33.68818491 47.75314367 ZT4-7 39.8141762625 38.26056793 41.367784595 ZT8-11 59.824800222499995 48.555639479999996 71.093960965 ZT12-15 118.196762215 116.24191903 120.1516054 ZT16-19 128.85504092500003 122.07552665 135.63455520000002 ZT20-23 124.412660575 119.36540629999999 129.45991485000002