condition mean min max ZT0-3 2.8779985564999997 1.535265168 4.220731945 ZT4-7 11.805195773 9.343976626 14.266414919999999 ZT8-11 13.3259919025 12.8043014 13.847682405 ZT12-15 12.48594961375 12.1557254395 12.816173788 ZT16-19 6.43611257575 5.761487389 7.1107377625 ZT20-23 9.14076052775 8.80601347 9.4755075855