condition mean min max ZT0-3 264.4 264.4 264.4 ZT4-7 494.1 494.1 494.1 ZT8-11 383.95000000000005 383.95000000000005 383.95000000000005 ZT12-15 330.55 330.55 330.55 ZT16-19 335.29999999999995 335.29999999999995 335.29999999999995 ZT20-23 269.4 269.4 269.4