condition mean min max ZT0-3 1.4777575 1.4531 1.502415 ZT4-7 1.10888 1.10888 1.10888 ZT8-11 0.4163295 0.4163295 0.4163295 ZT12-15 0 0 0 ZT16-19 0.7479815 0.7479815 0.7479815 ZT20-23 1.50431 1.50431 1.50431