condition mean min max ZT0-3 9.560304 9.560304 9.560304 ZT4-7 11.135975 11.135975 11.135975 ZT8-11 9.9522025 9.9522025 9.9522025 ZT12-15 10.2495315 10.2495315 10.2495315 ZT16-19 9.777694 9.777694 9.777694 ZT20-23 11.183155500000002 11.183155500000002 11.183155500000002