condition mean min max ZT0-3 3.6453225 3.28394 4.006705 ZT4-7 5.689255 5.689255 5.689255 ZT8-11 4.706575 4.706575 4.706575 ZT12-15 0 0 0 ZT16-19 4.93306 4.93306 4.93306 ZT20-23 5.02219 5.02219 5.02219