condition mean min max ZT0-3 52.18075 48.21615 55.41885 ZT4-7 39.6866 39.6866 39.6866 ZT8-11 37.1241 37.1241 37.1241 ZT12-15 64.99097499999999 64.94265 65.0393 ZT16-19 61.5249 61.5249 61.5249 ZT20-23 65.14655 65.14655 65.14655