condition mean min max ZT0-3 10.348383 10.348383 10.348383 ZT4-7 10.666538 10.666538 10.666538 ZT8-11 11.762431 11.762431 11.762431 ZT12-15 11.390638500000001 11.390638500000001 11.390638500000001 ZT16-19 11.131657 11.131657 11.131657 ZT20-23 11.8772895 11.8772895 11.8772895