condition mean min max ZT0-3 1.5581574999999999 0.623935 2.49238 ZT4-7 1.230325 1.230325 1.230325 ZT8-11 1.23457 1.23457 1.23457 ZT12-15 0 0 0 ZT16-19 4.28947 4.28947 4.28947 ZT20-23 1.23417 1.23417 1.23417