condition mean min max ZT0-3 71.4653204975 54.758986835 88.17165416 ZT4-7 40.950484217500005 36.40537079 45.495597645000004 ZT8-11 32.02848126 29.56411715 34.49284537 ZT12-15 11.59716715725 7.711636836 15.4826974785 ZT16-19 7.5585076605 7.23115859 7.8858567310000005 ZT20-23 6.814575261250001 5.8250130505 7.804137472000001