condition mean min max ZT0-3 138.752675 138.752675 138.752675 ZT4-7 124.89845500000001 124.89845500000001 124.89845500000001 ZT8-11 127.303293 127.303293 127.303293 ZT12-15 128.8358375 128.8358375 128.8358375 ZT16-19 178.3443705 178.3443705 178.3443705 ZT20-23 176.40810449999998 176.40810449999998 176.40810449999998