condition mean min max ZT0-3 262.614692 262.614692 262.614692 ZT4-7 295.8481485 295.8481485 295.8481485 ZT8-11 302.774502 302.774502 302.774502 ZT12-15 282.84848650000004 282.84848650000004 282.84848650000004 ZT16-19 207.735282 207.735282 207.735282 ZT20-23 156.7959445 156.7959445 156.7959445