condition mean min max ZT0-3 5.803221936 5.156926962 6.44951691 ZT4-7 33.55849373 21.29406337 45.82292409 ZT8-11 53.0369955175 52.0108021 54.063188935 ZT12-15 101.34156093 80.38640570999999 122.29671615000001 ZT16-19 151.02111932500003 127.6866214 174.35561725000002 ZT20-23 246.99419345 207.12786040000003 286.8605265