condition mean min max ZT0-3 39.200125 37.004099999999994 41.39615 ZT4-7 65.2784 65.2784 65.2784 ZT8-11 50.50195 50.50195 50.50195 ZT12-15 0 0 0 ZT16-19 54.58285 54.58285 54.58285 ZT20-23 59.12115 59.12115 59.12115