condition mean min max ZT0-3 12.327200000000001 10.99235 13.66205 ZT4-7 9.354164999999998 9.354164999999998 9.354164999999998 ZT8-11 8.31316 8.31316 8.31316 ZT12-15 0 0 0 ZT16-19 10.063535 10.063535 10.063535 ZT20-23 11.934249999999999 11.934249999999999 11.934249999999999