condition mean min max ZT0-3 10.33275 10.33275 10.33275 ZT4-7 8.284015 8.284015 8.284015 ZT8-11 7.421445 7.421445 7.421445 ZT12-15 8.10057 8.10057 8.10057 ZT16-19 12.4353 12.4353 12.4353 ZT20-23 10.892050000000001 10.892050000000001 10.892050000000001