condition mean min max ZT0-3 10.419215 10.419215 10.419215 ZT4-7 4.95406 4.95406 4.95406 ZT8-11 7.578375 7.578375 7.578375 ZT12-15 11.147 11.147 11.147 ZT16-19 10.709005 10.709005 10.709005 ZT20-23 6.78613 6.78613 6.78613