condition mean min max ZT0-3 5.5064916435 4.936506413 6.076476874 ZT4-7 2.6147983967500004 2.2619049455 2.9676918480000003 ZT8-11 3.9015139135000005 2.8170690245000003 4.985958802500001 ZT12-15 3.96566743475 3.824573366 4.1067615035 ZT16-19 2.61350718925 2.561924681 2.6650896975 ZT20-23 4.502463247750001 4.452361188 4.5525653075