condition mean min max ZT0-3 12.1802 11.2837 13.076699999999999 ZT4-7 11.07165 11.07165 11.07165 ZT8-11 8.18517 8.18517 8.18517 ZT12-15 0 0 0 ZT16-19 9.263395 9.263395 9.263395 ZT20-23 10.9812 10.9812 10.9812