condition mean min max ZT0-3 7.659506666666667 5.102195 9.198225 ZT4-7 5.645685 5.645685 5.645685 ZT8-11 10.101025 10.101025 10.101025 ZT12-15 9.26482 8.3345 10.19514 ZT16-19 9.975385 9.975385 9.975385 ZT20-23 13.151250000000001 13.151250000000001 13.151250000000001