condition mean min max ZT0-3 44.50123333333333 38.73095 52.986850000000004 ZT4-7 34.806349999999995 34.806349999999995 34.806349999999995 ZT8-11 16.692700000000002 16.692700000000002 16.692700000000002 ZT12-15 26.08625 25.00845 27.16405 ZT16-19 22.26425 22.26425 22.26425 ZT20-23 29.6369 29.6369 29.6369