condition mean min max ZT0-3 48.915775 48.915775 48.915775 ZT4-7 54.1005295 54.1005295 54.1005295 ZT8-11 58.752314999999996 58.752314999999996 58.752314999999996 ZT12-15 53.1837905 53.1837905 53.1837905 ZT16-19 47.892042000000004 47.892042000000004 47.892042000000004 ZT20-23 43.1635525 43.1635525 43.1635525