condition mean min max ZT0-3 0.3330575 0.2517025 0.41441249999999996 ZT4-7 0.917181 0.917181 0.917181 ZT8-11 0.4885265 0.4885265 0.4885265 ZT12-15 0 0 0 ZT16-19 0.21377449999999998 0.21377449999999998 0.21377449999999998 ZT20-23 0.8502335000000001 0.8502335000000001 0.8502335000000001