condition mean min max ZT0-3 15.104300000000002 12.759250000000002 17.449350000000003 ZT4-7 15.18385 15.18385 15.18385 ZT8-11 17.1307 17.1307 17.1307 ZT12-15 0 0 0 ZT16-19 15.34375 15.34375 15.34375 ZT20-23 9.82768 9.82768 9.82768