condition mean min max ZT0-3 9.918354 9.918354 9.918354 ZT4-7 9.003113500000001 9.003113500000001 9.003113500000001 ZT8-11 8.872625 8.872625 8.872625 ZT12-15 8.587939 8.587939 8.587939 ZT16-19 8.609963 8.609963 8.609963 ZT20-23 9.1547475 9.1547475 9.1547475