condition mean min max ZT0-3 5.90374 5.90374 5.90374 ZT4-7 4.792820000000001 4.792820000000001 4.792820000000001 ZT8-11 6.593954999999999 6.593954999999999 6.593954999999999 ZT12-15 7.816274999999999 7.816274999999999 7.816274999999999 ZT16-19 9.312065 9.312065 9.312065 ZT20-23 5.744785 5.744785 5.744785