condition mean min max ZT0-3 9.679743 9.679743 9.679743 ZT4-7 10.565517 10.565517 10.565517 ZT8-11 13.001257500000001 13.001257500000001 13.001257500000001 ZT12-15 11.764441999999999 11.764441999999999 11.764441999999999 ZT16-19 12.039214000000001 12.039214000000001 12.039214000000001 ZT20-23 10.561793999999999 10.561793999999999 10.561793999999999