condition mean min max ZT0-3 8.8971725 8.3544 9.439945 ZT4-7 10.121015 10.121015 10.121015 ZT8-11 7.17911 7.17911 7.17911 ZT12-15 0 0 0 ZT16-19 11.80885 11.80885 11.80885 ZT20-23 12.43825 12.43825 12.43825