condition mean min max ZT0-3 5.8694175 5.736795 6.00204 ZT4-7 6.107305 6.107305 6.107305 ZT8-11 5.8186599999999995 5.8186599999999995 5.8186599999999995 ZT12-15 0 0 0 ZT16-19 9.33525 9.33525 9.33525 ZT20-23 7.724825000000001 7.724825000000001 7.724825000000001