condition mean min max ZT0-3 729.693595 729.693595 729.693595 ZT4-7 868.3215895000001 868.3215895000001 868.3215895000001 ZT8-11 778.82374 778.82374 778.82374 ZT12-15 679.4566580000001 679.4566580000001 679.4566580000001 ZT16-19 693.974103 693.974103 693.974103 ZT20-23 651.602261 651.602261 651.602261