condition mean min max ZT0-3 23.048949999999998 23.048949999999998 23.048949999999998 ZT4-7 12.014700000000001 12.014700000000001 12.014700000000001 ZT8-11 15.549499999999998 15.549499999999998 15.549499999999998 ZT12-15 23.366349999999997 23.366349999999997 23.366349999999997 ZT16-19 38.302800000000005 38.302800000000005 38.302800000000005 ZT20-23 32.703 32.703 32.703