condition mean min max ZT0-3 42.984925 40.073049999999995 45.8968 ZT4-7 40.823899999999995 40.823899999999995 40.823899999999995 ZT8-11 18.483150000000002 18.483150000000002 18.483150000000002 ZT12-15 0 0 0 ZT16-19 23.894 23.894 23.894 ZT20-23 52.01955 52.01955 52.01955