condition mean min max ZT0-3 289.370369 289.370369 289.370369 ZT4-7 314.332334 314.332334 314.332334 ZT8-11 380.22011499999996 380.22011499999996 380.22011499999996 ZT12-15 562.7317065 562.7317065 562.7317065 ZT16-19 450.4076105 450.4076105 450.4076105 ZT20-23 619.5619655 619.5619655 619.5619655