condition mean min max ZT0-3 8.960474999999999 8.960474999999999 8.960474999999999 ZT4-7 6.18674 6.18674 6.18674 ZT8-11 8.19284 8.19284 8.19284 ZT12-15 8.723415 8.723415 8.723415 ZT16-19 11.599699999999999 11.599699999999999 11.599699999999999 ZT20-23 10.10068 10.10068 10.10068