condition mean min max ZT0-3 24.1 24.1 24.1 ZT4-7 20.2 20.2 20.2 ZT8-11 23.2 23.2 23.2 ZT12-15 13.5 13.5 13.5 ZT16-19 29.450000000000003 29.450000000000003 29.450000000000003 ZT20-23 23.15 23.15 23.15