condition mean min max ZT0-3 3.4503500000000003 3.4503500000000003 3.4503500000000003 ZT4-7 2.8078399999999997 2.8078399999999997 2.8078399999999997 ZT8-11 2.96204 2.96204 2.96204 ZT12-15 3.54791 3.54791 3.54791 ZT16-19 5.42214 5.42214 5.42214 ZT20-23 3.5705150000000003 3.5705150000000003 3.5705150000000003