condition mean min max ZT0-3 35.0167 29.0061 41.0273 ZT4-7 23.6912 23.6912 23.6912 ZT8-11 31.140349999999998 31.140349999999998 31.140349999999998 ZT12-15 0 0 0 ZT16-19 46.383449999999996 46.383449999999996 46.383449999999996 ZT20-23 35.97245 35.97245 35.97245