condition mean min max ZT0-3 264.429249 264.429249 264.429249 ZT4-7 277.85161300000004 277.85161300000004 277.85161300000004 ZT8-11 274.155841 274.155841 274.155841 ZT12-15 286.996974 286.996974 286.996974 ZT16-19 298.2767905 298.2767905 298.2767905 ZT20-23 280.87615200000005 280.87615200000005 280.87615200000005