condition mean min max ZT0-3 1260.581142 1260.581142 1260.581142 ZT4-7 627.138282 627.138282 627.138282 ZT8-11 358.50821499999995 358.50821499999995 358.50821499999995 ZT12-15 384.5719355 384.5719355 384.5719355 ZT16-19 485.06189 485.06189 485.06189 ZT20-23 589.565159 589.565159 589.565159