condition mean min max ZT0-3 19.217633333333332 14.3962 22.13565 ZT4-7 14.6539 14.6539 14.6539 ZT8-11 10.388200000000001 10.388200000000001 10.388200000000001 ZT12-15 13.451899999999998 12.1886 14.7152 ZT16-19 14.7403 14.7403 14.7403 ZT20-23 24.849249999999998 24.849249999999998 24.849249999999998