condition mean min max ZT0-3 6.700609999999999 2.759755 10.891649999999998 ZT4-7 11.689900000000002 11.689900000000002 11.689900000000002 ZT8-11 9.698049999999999 9.698049999999999 9.698049999999999 ZT12-15 5.9171025 2.712525 9.121680000000001 ZT16-19 10.41105 10.41105 10.41105 ZT20-23 8.508575 8.508575 8.508575