condition mean min max ZT0-3 116.401674 116.401674 116.401674 ZT4-7 220.8163355 220.8163355 220.8163355 ZT8-11 249.9477195 249.9477195 249.9477195 ZT12-15 258.848571 258.848571 258.848571 ZT16-19 188.020954 188.020954 188.020954 ZT20-23 181.0558235 181.0558235 181.0558235