condition mean min max ZT0-3 407.687429 407.687429 407.687429 ZT4-7 376.6696955 376.6696955 376.6696955 ZT8-11 398.647474 398.647474 398.647474 ZT12-15 603.2042625 603.2042625 603.2042625 ZT16-19 643.258157 643.258157 643.258157 ZT20-23 800.5767085 800.5767085 800.5767085