condition mean min max ZT0-3 744.9219391500001 544.2835196999999 945.5603586000001 ZT4-7 238.02791815 200.38049235 275.67534395 ZT8-11 152.063790975 141.3817331 162.74584885 ZT12-15 142.7365285 132.82604045 152.64701655 ZT16-19 181.63233317499999 172.07580985 191.18885649999999 ZT20-23 237.801599875 219.3139764 256.28922335