condition mean min max ZT0-3 10.9433375 8.811824999999999 13.074850000000001 ZT4-7 12.14695 12.14695 12.14695 ZT8-11 5.5921 5.5921 5.5921 ZT12-15 0 0 0 ZT16-19 6.972365 6.972365 6.972365 ZT20-23 14.7605 14.7605 14.7605