condition mean min max ZT0-3 10.5720725 9.815545 11.3286 ZT4-7 5.17564 5.17564 5.17564 ZT8-11 5.713565 5.713565 5.713565 ZT12-15 0 0 0 ZT16-19 8.29463 8.29463 8.29463 ZT20-23 8.334705 8.334705 8.334705