condition mean min max ZT0-3 10.158474 10.158474 10.158474 ZT4-7 8.200212 8.200212 8.200212 ZT8-11 10.044085500000001 10.044085500000001 10.044085500000001 ZT12-15 9.230215 9.230215 9.230215 ZT16-19 7.653936 7.653936 7.653936 ZT20-23 9.0041245 9.0041245 9.0041245