condition mean min max ZT0-3 8.590485000000001 7.845470000000001 9.3355 ZT4-7 9.505040000000001 9.505040000000001 9.505040000000001 ZT8-11 10.06246 10.06246 10.06246 ZT12-15 0 0 0 ZT16-19 11.20135 11.20135 11.20135 ZT20-23 13.70025 13.70025 13.70025