condition mean min max ZT0-3 5.4782475 5.00643 5.950065 ZT4-7 4.008915 4.008915 4.008915 ZT8-11 5.8130500000000005 5.8130500000000005 5.8130500000000005 ZT12-15 0 0 0 ZT16-19 4.977795 4.977795 4.977795 ZT20-23 6.229145000000001 6.229145000000001 6.229145000000001