condition mean min max ZT0-3 653.770518 653.770518 653.770518 ZT4-7 871.1664470000001 871.1664470000001 871.1664470000001 ZT8-11 696.22044 696.22044 696.22044 ZT12-15 474.551461 474.551461 474.551461 ZT16-19 552.707401 552.707401 552.707401 ZT20-23 390.726341 390.726341 390.726341