condition mean min max ZT0-3 985.9 985.9 985.9 ZT4-7 798.3 798.3 798.3 ZT8-11 811.8 811.8 811.8 ZT12-15 838.4 838.4 838.4 ZT16-19 714.4000000000001 714.4000000000001 714.4000000000001 ZT20-23 862.1 862.1 862.1