condition mean min max ZT0-3 11.37726 11.37726 11.37726 ZT4-7 12.424145 12.424145 12.424145 ZT8-11 11.098597999999999 11.098597999999999 11.098597999999999 ZT12-15 9.5155045 9.5155045 9.5155045 ZT16-19 11.914836000000001 11.914836000000001 11.914836000000001 ZT20-23 9.9721275 9.9721275 9.9721275