condition mean min max ZT0-3 9.234465 5.634745000000001 11.138 ZT4-7 6.2296499999999995 6.2296499999999995 6.2296499999999995 ZT8-11 6.0221 6.0221 6.0221 ZT12-15 8.667212500000002 7.273535000000001 10.06089 ZT16-19 10.2579 10.2579 10.2579 ZT20-23 11.508099999999999 11.508099999999999 11.508099999999999