condition mean min max ZT0-3 15.100200000000001 15.100200000000001 15.100200000000001 ZT4-7 12.288450000000001 12.288450000000001 12.288450000000001 ZT8-11 15.12725 15.12725 15.12725 ZT12-15 14.355699999999999 14.355699999999999 14.355699999999999 ZT16-19 20.249299999999998 20.249299999999998 20.249299999999998 ZT20-23 16.60875 16.60875 16.60875