condition mean min max ZT0-3 9.192432 9.192432 9.192432 ZT4-7 10.558373 10.558373 10.558373 ZT8-11 9.5154485 9.5154485 9.5154485 ZT12-15 10.963984 10.963984 10.963984 ZT16-19 8.8137425 8.8137425 8.8137425 ZT20-23 9.367898499999999 9.367898499999999 9.367898499999999