condition mean min max ZT0-3 2.680627436 1.419414037 3.941840835 ZT4-7 10.7099359875 6.7279222455 14.6919497295 ZT8-11 43.9975591825 31.967798424999998 56.02731994 ZT12-15 51.59052926 50.334374929999996 52.84668359 ZT16-19 56.579925259999996 51.797209255 61.36264126499999 ZT20-23 58.274421507499994 50.741258939999994 65.807584075