condition mean min max ZT0-3 10.825935 10.584019999999999 11.06785 ZT4-7 10.85305 10.85305 10.85305 ZT8-11 7.22656 7.22656 7.22656 ZT12-15 0 0 0 ZT16-19 7.31784 7.31784 7.31784 ZT20-23 10.77097 10.77097 10.77097