condition mean min max ZT0-3 31.44795 31.44795 31.44795 ZT4-7 35.3267 35.3267 35.3267 ZT8-11 35.0606 35.0606 35.0606 ZT12-15 36.9781 36.9781 36.9781 ZT16-19 26.46235 26.46235 26.46235 ZT20-23 29.262700000000002 29.262700000000002 29.262700000000002