condition mean min max ZT0-3 900.738499 900.738499 900.738499 ZT4-7 192.15199049999998 192.15199049999998 192.15199049999998 ZT8-11 110.396243 110.396243 110.396243 ZT12-15 200.8516985 200.8516985 200.8516985 ZT16-19 733.9453935 733.9453935 733.9453935 ZT20-23 1022.8723175 1022.8723175 1022.8723175