condition mean min max ZT0-3 2095.27499 2095.27499 2095.27499 ZT4-7 557.4769974999999 557.4769974999999 557.4769974999999 ZT8-11 692.073957 692.073957 692.073957 ZT12-15 946.7005845000001 946.7005845000001 946.7005845000001 ZT16-19 1333.5172515 1333.5172515 1333.5172515 ZT20-23 1352.9551045 1352.9551045 1352.9551045