condition mean min max ZT0-3 1.01091 1.01091 1.01091 ZT4-7 0.8052435 0.8052435 0.8052435 ZT8-11 1.3870149999999999 1.3870149999999999 1.3870149999999999 ZT12-15 1.5713650000000001 1.5713650000000001 1.5713650000000001 ZT16-19 1.9494749999999998 1.9494749999999998 1.9494749999999998 ZT20-23 1.47217 1.47217 1.47217