condition mean min max ZT0-3 58.1 58.1 58.1 ZT4-7 39.9 39.9 39.9 ZT8-11 29.450000000000003 29.450000000000003 29.450000000000003 ZT12-15 32.15 32.15 32.15 ZT16-19 51.05 51.05 51.05 ZT20-23 48.05 48.05 48.05