condition mean min max ZT0-3 11.554701 11.554701 11.554701 ZT4-7 10.3891645 10.3891645 10.3891645 ZT8-11 10.030205500000001 10.030205500000001 10.030205500000001 ZT12-15 9.701108999999999 9.701108999999999 9.701108999999999 ZT16-19 9.3615775 9.3615775 9.3615775 ZT20-23 10.758535 10.758535 10.758535