condition mean min max ZT0-3 8.5252275 7.7619050000000005 9.28855 ZT4-7 11.13215 11.13215 11.13215 ZT8-11 13.6688 13.6688 13.6688 ZT12-15 0 0 0 ZT16-19 9.633315 9.633315 9.633315 ZT20-23 7.204805 7.204805 7.204805