condition mean min max ZT0-3 14.361971 14.361971 14.361971 ZT4-7 20.067444000000002 20.067444000000002 20.067444000000002 ZT8-11 16.526948 16.526948 16.526948 ZT12-15 14.339579 14.339579 14.339579 ZT16-19 14.644513 14.644513 14.644513 ZT20-23 13.519498 13.519498 13.519498