condition mean min max ZT0-3 488.55 488.55 488.55 ZT4-7 532.8 532.8 532.8 ZT8-11 492.25 492.25 492.25 ZT12-15 493.5 493.5 493.5 ZT16-19 511.3 511.3 511.3 ZT20-23 489.75 489.75 489.75