condition mean min max ZT0-3 3.8741174999999997 3.2828549999999996 4.46538 ZT4-7 3.6928149999999995 3.6928149999999995 3.6928149999999995 ZT8-11 5.45232 5.45232 5.45232 ZT12-15 0 0 0 ZT16-19 5.853755 5.853755 5.853755 ZT20-23 5.110110000000001 5.110110000000001 5.110110000000001