condition mean min max ZT0-3 5.1099825 4.035525 6.18444 ZT4-7 8.185369999999999 8.185369999999999 8.185369999999999 ZT8-11 10.2813 10.2813 10.2813 ZT12-15 0 0 0 ZT16-19 11.0563 11.0563 11.0563 ZT20-23 7.77721 7.77721 7.77721