condition mean min max ZT0-3 38.25835 34.280950000000004 42.235749999999996 ZT4-7 79.53645 79.53645 79.53645 ZT8-11 26.47155 26.47155 26.47155 ZT12-15 0 0 0 ZT16-19 5.757615 5.757615 5.757615 ZT20-23 34.47885 34.47885 34.47885