condition mean min max ZT0-3 37.009087 37.009087 37.009087 ZT4-7 47.426285 47.426285 47.426285 ZT8-11 42.673407499999996 42.673407499999996 42.673407499999996 ZT12-15 39.2018625 39.2018625 39.2018625 ZT16-19 42.808944 42.808944 42.808944 ZT20-23 45.5444085 45.5444085 45.5444085