condition mean min max ZT0-3 1.635625191 1.30888369 1.9623666919999998 ZT4-7 3.9493156287499995 3.143579772 4.755051485499999 ZT8-11 8.3723008375 6.008605412 10.735996263 ZT12-15 7.43218132775 6.3473237815 8.517038874 ZT16-19 4.08673388075 3.893063423 4.2804043385 ZT20-23 6.14388462525 5.1543221045 7.133447146