condition mean min max ZT0-3 659.5 659.5 659.5 ZT4-7 736.7 736.7 736.7 ZT8-11 658.4000000000001 658.4000000000001 658.4000000000001 ZT12-15 502.84999999999997 502.84999999999997 502.84999999999997 ZT16-19 583.7 583.7 583.7 ZT20-23 699.8 699.8 699.8