condition mean min max ZT0-3 487.4 487.4 487.4 ZT4-7 491.0 491.0 491.0 ZT8-11 515.9 515.9 515.9 ZT12-15 489.15 489.15 489.15 ZT16-19 409.6 409.6 409.6 ZT20-23 348.7 348.7 348.7