condition mean min max ZT0-3 5.3602325 4.683505 6.0369600000000005 ZT4-7 2.9515450000000003 2.9515450000000003 2.9515450000000003 ZT8-11 2.616445 2.616445 2.616445 ZT12-15 0 0 0 ZT16-19 4.01515 4.01515 4.01515 ZT20-23 3.560505 3.560505 3.560505