condition mean min max ZT0-3 57.944603 57.944603 57.944603 ZT4-7 31.8745435 31.8745435 31.8745435 ZT8-11 27.0260245 27.0260245 27.0260245 ZT12-15 37.2409335 37.2409335 37.2409335 ZT16-19 24.773917 24.773917 24.773917 ZT20-23 23.724831000000002 23.724831000000002 23.724831000000002