condition mean min max ZT0-3 27.968425 25.26815 30.6687 ZT4-7 28.62335 28.62335 28.62335 ZT8-11 35.720349999999996 35.720349999999996 35.720349999999996 ZT12-15 0 0 0 ZT16-19 44.7669 44.7669 44.7669 ZT20-23 37.962500000000006 37.962500000000006 37.962500000000006