condition mean min max ZT0-3 0.5547511666666667 0.46435499999999996 0.6294925 ZT4-7 0.2620295 0.2620295 0.2620295 ZT8-11 1.8110715 1.8110715 1.8110715 ZT12-15 1.6897242499999998 0.9272335 2.452215 ZT16-19 1.0554700000000001 1.0554700000000001 1.0554700000000001 ZT20-23 1.100975 1.100975 1.100975