condition mean min max ZT0-3 135.338225 89.56944999999999 181.107 ZT4-7 7.263895 7.263895 7.263895 ZT8-11 1.2934649999999999 1.2934649999999999 1.2934649999999999 ZT12-15 0 0 0 ZT16-19 8.395800000000001 8.395800000000001 8.395800000000001 ZT20-23 26.975250000000003 26.975250000000003 26.975250000000003