condition mean min max ZT0-3 614.058098 614.058098 614.058098 ZT4-7 458.307271 458.307271 458.307271 ZT8-11 503.8093455 503.8093455 503.8093455 ZT12-15 546.3899799999999 546.3899799999999 546.3899799999999 ZT16-19 684.982052 684.982052 684.982052 ZT20-23 663.419854 663.419854 663.419854