condition mean min max ZT0-3 33.38028333333333 14.7476 45.4626 ZT4-7 15.78305 15.78305 15.78305 ZT8-11 15.0901 15.0901 15.0901 ZT12-15 21.18715 15.44685 26.92745 ZT16-19 31.785249999999998 31.785249999999998 31.785249999999998 ZT20-23 47.27735 47.27735 47.27735