condition mean min max ZT0-3 10.572297500000001 8.03223 13.112365 ZT4-7 19.81795 19.81795 19.81795 ZT8-11 23.47745 23.47745 23.47745 ZT12-15 0 0 0 ZT16-19 22.365499999999997 22.365499999999997 22.365499999999997 ZT20-23 15.9819 15.9819 15.9819