condition mean min max ZT0-3 320.845348 320.845348 320.845348 ZT4-7 265.54047149999997 265.54047149999997 265.54047149999997 ZT8-11 281.9643495 281.9643495 281.9643495 ZT12-15 419.72348999999997 419.72348999999997 419.72348999999997 ZT16-19 746.6776729999999 746.6776729999999 746.6776729999999 ZT20-23 1056.2949025 1056.2949025 1056.2949025