condition mean min max ZT0-3 0.31873664999999995 0.1811588 0.45631449999999996 ZT4-7 0.227798 0.227798 0.227798 ZT8-11 0.6354960000000001 0.6354960000000001 0.6354960000000001 ZT12-15 0 0 0 ZT16-19 0.224628 0.224628 0.224628 ZT20-23 0.180394 0.180394 0.180394