condition mean min max ZT0-3 4.4973981245 3.566374944 5.428421305 ZT4-7 2.0906590874999997 1.111289354 3.0700288209999997 ZT8-11 9.13858872325 6.4169298464999995 11.860247600000001 ZT12-15 11.161387909750001 10.0428095595 12.27996626 ZT16-19 8.94967226975 8.609049157 9.2902953825 ZT20-23 12.842129455 11.733422175000001 13.950836735