condition mean min max ZT0-3 9.415135 9.415135 9.415135 ZT4-7 10.756364999999999 10.756364999999999 10.756364999999999 ZT8-11 11.0348 11.0348 11.0348 ZT12-15 11.4285 11.4285 11.4285 ZT16-19 15.136099999999999 15.136099999999999 15.136099999999999 ZT20-23 11.35445 11.35445 11.35445