condition mean min max ZT0-3 34.0309870075 31.21897544 36.842998574999996 ZT4-7 25.83788117 23.57516175 28.10060059 ZT8-11 36.284855934999996 30.195568700000003 42.374143169999996 ZT12-15 27.134957835 22.283626390000002 31.98628928 ZT16-19 19.76056908 18.672415905 20.848722255 ZT20-23 27.298753445 25.928256425 28.669250464999998