condition mean min max ZT0-3 12.08575 12.08575 12.08575 ZT4-7 8.098575 8.098575 8.098575 ZT8-11 7.940075 7.940075 7.940075 ZT12-15 10.157705 10.157705 10.157705 ZT16-19 14.9784 14.9784 14.9784 ZT20-23 13.60005 13.60005 13.60005