condition mean min max ZT0-3 1.64402 1.64402 1.64402 ZT4-7 1.6356190000000002 1.6356190000000002 1.6356190000000002 ZT8-11 1.4459825 1.4459825 1.4459825 ZT12-15 2.026494 2.026494 2.026494 ZT16-19 1.618734 1.618734 1.618734 ZT20-23 1.86389 1.86389 1.86389