condition mean min max ZT0-3 3.1746566410000003 1.082224219 5.267089063 ZT4-7 10.60565259275 6.3050073185 14.906297867 ZT8-11 28.6569818275 23.75661709 33.557346565 ZT12-15 25.9504659125 20.042556275000003 31.858375549999998 ZT16-19 15.421625460000001 14.867771840000001 15.97547908 ZT20-23 12.10417464 11.757699174999999 12.450650105000001