condition mean min max ZT0-3 11.697199999999999 11.697199999999999 11.697199999999999 ZT4-7 9.43449 9.43449 9.43449 ZT8-11 4.34159 4.34159 4.34159 ZT12-15 5.1184899999999995 5.1184899999999995 5.1184899999999995 ZT16-19 6.634535 6.634535 6.634535 ZT20-23 9.949200000000001 9.949200000000001 9.949200000000001