condition mean min max ZT0-3 67.947837 67.947837 67.947837 ZT4-7 58.39657750000001 58.39657750000001 58.39657750000001 ZT8-11 90.52317 90.52317 90.52317 ZT12-15 85.80330599999999 85.80330599999999 85.80330599999999 ZT16-19 83.3169195 83.3169195 83.3169195 ZT20-23 75.9503655 75.9503655 75.9503655