condition mean min max ZT0-3 5.5779049999999994 5.5779049999999994 5.5779049999999994 ZT4-7 6.69066 6.69066 6.69066 ZT8-11 6.176159999999999 6.176159999999999 6.176159999999999 ZT12-15 5.76063 5.76063 5.76063 ZT16-19 4.432455 4.432455 4.432455 ZT20-23 4.08209 4.08209 4.08209