condition mean min max ZT0-3 53.036610599999996 35.35021096 70.72301024 ZT4-7 33.480170085 32.30991264 34.65042753 ZT8-11 45.8324067175 36.02755268 55.637260755 ZT12-15 42.085638097499995 34.144822485 50.02645371 ZT16-19 51.557098082500005 48.59345751 54.520738655 ZT20-23 64.6742220475 59.140735115 70.20770898