condition mean min max ZT0-3 2.92456 2.735825 3.113295 ZT4-7 3.172205 3.172205 3.172205 ZT8-11 2.948565 2.948565 2.948565 ZT12-15 0 0 0 ZT16-19 3.20958 3.20958 3.20958 ZT20-23 2.8088699999999998 2.8088699999999998 2.8088699999999998