condition mean min max ZT0-3 4.967225 3.72818 6.20627 ZT4-7 5.73 5.73 5.73 ZT8-11 4.97073 4.97073 4.97073 ZT12-15 0 0 0 ZT16-19 8.786095 8.786095 8.786095 ZT20-23 5.1429 5.1429 5.1429