condition mean min max ZT0-3 10.24515 10.24515 10.24515 ZT4-7 7.340185 7.340185 7.340185 ZT8-11 8.38162 8.38162 8.38162 ZT12-15 8.914525000000001 8.914525000000001 8.914525000000001 ZT16-19 12.356300000000001 12.356300000000001 12.356300000000001 ZT20-23 11.4314 11.4314 11.4314