condition mean min max ZT0-3 13.648225 13.648225 13.648225 ZT4-7 15.7631295 15.7631295 15.7631295 ZT8-11 19.345613 19.345613 19.345613 ZT12-15 15.957716 15.957716 15.957716 ZT16-19 12.355187 12.355187 12.355187 ZT20-23 10.4358215 10.4358215 10.4358215