condition mean min max ZT0-3 2.4066 2.160985 2.652215 ZT4-7 0.7747435 0.7747435 0.7747435 ZT8-11 1.9020350000000001 1.9020350000000001 1.9020350000000001 ZT12-15 0 0 0 ZT16-19 1.615625 1.615625 1.615625 ZT20-23 1.45215 1.45215 1.45215