condition mean min max ZT0-3 0.55968318025 0.443652517 0.6757138435 ZT4-7 0.5489092637499999 0.5159506285 0.5818678989999999 ZT8-11 0.31118680825 0.30287932900000003 0.3194942875 ZT12-15 0.17742176199999998 0.15703219899999998 0.19781132499999998 ZT16-19 0.2144616215 0.1990238675 0.2298993755 ZT20-23 0.38006938999999995 0.33734941749999997 0.4227893625