condition mean min max ZT0-3 2.0636650000000003 2.0636650000000003 2.0636650000000003 ZT4-7 1.7490100000000002 1.7490100000000002 1.7490100000000002 ZT8-11 2.855545 2.855545 2.855545 ZT12-15 2.809635 2.809635 2.809635 ZT16-19 2.944965 2.944965 2.944965 ZT20-23 1.781455 1.781455 1.781455