condition mean min max ZT0-3 5050.95 5050.95 5050.95 ZT4-7 5433.3 5433.3 5433.3 ZT8-11 4242.65 4242.65 4242.65 ZT12-15 2571.0 2571.0 2571.0 ZT16-19 1406.5500000000002 1406.5500000000002 1406.5500000000002 ZT20-23 2237.2 2237.2 2237.2