condition mean min max ZT0-3 28.303625 27.4637 29.14355 ZT4-7 23.98785 23.98785 23.98785 ZT8-11 22.21565 22.21565 22.21565 ZT12-15 0 0 0 ZT16-19 30.96515 30.96515 30.96515 ZT20-23 29.194850000000002 29.194850000000002 29.194850000000002