condition mean min max ZT0-3 238.75743525833335 232.87251055000002 244.64235996666667 ZT4-7 169.37882285 149.7357725 189.0218732 ZT8-11 113.3626085 105.28828229999999 121.4369347 ZT12-15 103.235350195 98.35816339 108.11253699999999 ZT16-19 123.33909686666667 113.65912130000001 133.01907243333332 ZT20-23 160.47625181666666 139.39626016666665 181.55624346666667