condition mean min max ZT0-3 286.413549 286.413549 286.413549 ZT4-7 281.6887745 281.6887745 281.6887745 ZT8-11 212.489634 212.489634 212.489634 ZT12-15 336.8846275 336.8846275 336.8846275 ZT16-19 475.04058299999997 475.04058299999997 475.04058299999997 ZT20-23 826.0470795 826.0470795 826.0470795