condition mean min max ZT0-3 12.810475 12.446449999999999 13.1745 ZT4-7 12.3828 12.3828 12.3828 ZT8-11 10.96045 10.96045 10.96045 ZT12-15 0 0 0 ZT16-19 9.719935 9.719935 9.719935 ZT20-23 14.876349999999999 14.876349999999999 14.876349999999999