condition mean min max ZT0-3 416.0 416.0 416.0 ZT4-7 407.6 407.6 407.6 ZT8-11 330.15 330.15 330.15 ZT12-15 381.5 381.5 381.5 ZT16-19 431.55 431.55 431.55 ZT20-23 442.75 442.75 442.75