condition mean min max ZT0-3 1.8684349999999998 1.85408 1.88279 ZT4-7 2.1443849999999998 2.1443849999999998 2.1443849999999998 ZT8-11 0.9787855000000001 0.9787855000000001 0.9787855000000001 ZT12-15 0 0 0 ZT16-19 1.46013 1.46013 1.46013 ZT20-23 2.4360049999999998 2.4360049999999998 2.4360049999999998