condition mean min max ZT0-3 0.8040651666666667 0.5183595000000001 1.1612905 ZT4-7 0.16472199999999998 0.16472199999999998 0.16472199999999998 ZT8-11 0.12749824999999998 0.12749824999999998 0.12749824999999998 ZT12-15 0.3750255 0.265963 0.484088 ZT16-19 0.367376 0.367376 0.367376 ZT20-23 0.8601810000000001 0.8601810000000001 0.8601810000000001